Journal of Superconductivity and Novel Magnetism最新文献

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Design, Manufacture and Test of the Low Temperature Superconducting Coil for Extra-High Speed Electro-Dynamic Suspension System 超高速电动悬架系统低温超导线圈的设计、制造与试验
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-05-02 DOI: 10.1007/s10948-026-07179-8
Wei Zhou, Kun Liu, Ruizhe Zhang, Jinpeng Yu, Zian Zhu, Xuehua Zhang, Zhihua Zhang
{"title":"Design, Manufacture and Test of the Low Temperature Superconducting Coil for Extra-High Speed Electro-Dynamic Suspension System","authors":"Wei Zhou,&nbsp;Kun Liu,&nbsp;Ruizhe Zhang,&nbsp;Jinpeng Yu,&nbsp;Zian Zhu,&nbsp;Xuehua Zhang,&nbsp;Zhihua Zhang","doi":"10.1007/s10948-026-07179-8","DOIUrl":"10.1007/s10948-026-07179-8","url":null,"abstract":"<div><p>The low temperature superconducting (SC) coil is considered as an easy-implement candidate for onboard superconducting magnet of the electro-dynamic suspension (EDS) due to its mature fabrication process, low material cost, reversible quench, ductile mechanical properties and long-manufactured commercial strand. The complicated electromagnetic and mechanical vibration poses many difficulties for the design and manufacture of the SC coil, particularly, under the circumstance of extra-high speed. In this work, we firstly design the SC coil considering the vibration suppression and stiffness enhancement, and magnetic field, Lorentz force and modal frequencies are analyzed. Afterwards according to the thoughtful design, we manufacture the SC coil including persistence current switch (PCS), protect diode, reinforcement structures and insulation spacers. We then introduce the cost-saving experimental system to evaluate the electromagnetic and mechanical properties of the SC coil based on coolant-soaking method. Finally, we focus lots of efforts in the SC coil measurements and results discussions. The voltage, current and magnetic field behaviors in different operating modes of current charging, current closed-loop, current discharging and quench are measured. The strains of the SC coil during cooling and current charging process are measured, and the simulated results are compared. It is shown that the SC coil can be repeatedly charged the current of 325 A while the operation current is 250 A, which proves the SC coil have sufficient safe margin in critical current. The current decay rate of 0.114%/day indicates the feasibility of the long-time operation of the EDS system. The maximum strain during cooling process is up to ~ 1500 μm/m which is similar to simulated results. The acceptable strain can further confirm that the designed reinforcement structures are effective. The results of this study may provide useful information for the design, manufacture and test of the SC coil for onboard SC magnet in extra-high-speed EDS system.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Probing Spin Relaxation Process through Impedance Spectroscopy across Organic Magnetic Tunnel Junctions 用阻抗谱法探测有机磁性隧道结的自旋弛豫过程
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-30 DOI: 10.1007/s10948-026-07181-0
Lakshmi Alekya Maddi, Pamulapati Soujanya, Sandip Swarnakar, Muzammil Parvez M, Debajit Deb
{"title":"Probing Spin Relaxation Process through Impedance Spectroscopy across Organic Magnetic Tunnel Junctions","authors":"Lakshmi Alekya Maddi,&nbsp;Pamulapati Soujanya,&nbsp;Sandip Swarnakar,&nbsp;Muzammil Parvez M,&nbsp;Debajit Deb","doi":"10.1007/s10948-026-07181-0","DOIUrl":"10.1007/s10948-026-07181-0","url":null,"abstract":"<div>\u0000 \u0000 <p>In this paper we have investigated the effect of magnetic field on impedance spectroscopy of ITO/NiFe<span>(_{2})</span>O<span>(_{4})</span>(NFO)/Alq<span>(_{3})</span>/Co/Au organic magnetic tunnel junctions at room temperature. A rise of resistive component (Z’) at low frequency indicated larger spin flip scattering at NFO/Alq<span>(_{3})</span> defect states of the device with magnetic field. Cross-over of zero field Z’ with high field data at resonance peak frequency indicated predominant spin dependent scattering at spin-split band of Co. Extracted RC components corresponding to interface and bulk indicates interface spin flip scattering induced spin dependent scattering at spin split band of Co. Hence a high NFO/Alq<span>(_{3})</span> interface resonance frequency indicated a sharp fall of Co bulk resonance frequency at an intermediate magnetic field where the spin flip scattering is maximum. Such control of spin-split band scattering through interface scattering can help to discover high performance MTJ devices in near future.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147797027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigating the Structural, Elastic, Electronic, Magnetic and Thermodynamic Properties of Full-Heusler Alloys Pr2CoZ (Z = Al, Ga and In) 全heusler合金Pr2CoZ (Z = Al, Ga和In)的结构、弹性、电子、磁性和热力学性能研究
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-28 DOI: 10.1007/s10948-026-07182-z
Abdelkader Ilias Bouadi, Mahdi Abane, Mohamed Hammadi, Aissam Hidoussi, Mohamed Mokhtari, Fethallah Dahmane
{"title":"Investigating the Structural, Elastic, Electronic, Magnetic and Thermodynamic Properties of Full-Heusler Alloys Pr2CoZ (Z = Al, Ga and In)","authors":"Abdelkader Ilias Bouadi,&nbsp;Mahdi Abane,&nbsp;Mohamed Hammadi,&nbsp;Aissam Hidoussi,&nbsp;Mohamed Mokhtari,&nbsp;Fethallah Dahmane","doi":"10.1007/s10948-026-07182-z","DOIUrl":"10.1007/s10948-026-07182-z","url":null,"abstract":"<div>\u0000 \u0000 <p>The structural, electronic, and magnetic characteristics of full-Heusler compounds Pr₂CoZ (where Z = Al, Ga, In) in Hg₂CuTi-type and Cu₂MnAl-type configurations were examined utilizing the first principle based on the FP-LAPW with Generalized gradient approximation (GGA) implemented in WIEN2k software. The Hg₂CuTi-type structure demonstrated superior stability compared to the Cu₂MnAl-type structure at ambient conditions for all compounds. The Hg₂CuTi-type structure demonstrated superior stability compared to the Cu₂MnAl-type at ambient conditions for all compounds, with optimized lattice parameters of 6.85 Å (Pr₂CoAl), 6.82 Å (Pr₂CoGa), and 7.02 Å (Pr₂CoIn). These compounds display the characters of indirect band gap semiconductors, possessing energy band gaps of 0.359, 0.483, and 0.492 eV for Pr<sub>2</sub>CoAl, Pr<sub>2</sub>CoGa, and Pr<sub>2</sub>CoIn, respectively. Our alloys exhibited half-metallic (HM) characteristics with an indirect band gap and a total magnetic moment of 4 µB, by the Slater-Pauling (SP) rule. The thermodynamic characteristics were assessed at temperatures ranging from 0 to 1000 K and pressures from 0 to 20 GPa utilizing the quasi-harmonic Debye model. The analysis of the elastic characteristics validated the mechanical stability of the three alloys inside the examined structure, demonstrating a strong correlation between the derived bulk modulus from the structural properties and that obtained from the elastic values. Additionally, other elastic characteristics, including modulus B, shear modulus G, Young’s modulus E, Poisson’s ratio (v), Pugh’s ratio (κ), and the Zener anisotropy parameter (A), indicate that the Pr<sub>2</sub>CoZ (Z = Al, Ga, and In) alloys exhibit high anisotropy, and ductile behaviour.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Structural and Magnetic Properties of Fe–Si–C Amorphous Ribbons and their Potential for High-Frequency AC Applications Fe-Si-C非晶带的结构和磁性能及其高频交流应用潜力
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-28 DOI: 10.1007/s10948-026-07178-9
Aida Isayeva, Valik Ahmadov, Nurlan Rafiyev, Yernat Kozhakhmetov, Elfira Sagymbekova
{"title":"Structural and Magnetic Properties of Fe–Si–C Amorphous Ribbons and their Potential for High-Frequency AC Applications","authors":"Aida Isayeva,&nbsp;Valik Ahmadov,&nbsp;Nurlan Rafiyev,&nbsp;Yernat Kozhakhmetov,&nbsp;Elfira Sagymbekova","doi":"10.1007/s10948-026-07178-9","DOIUrl":"10.1007/s10948-026-07178-9","url":null,"abstract":"<div>\u0000 \u0000 <p>Amorphous Fe–Si–C ribbons represent an underexplored class of soft magnetic materials with potential advantages for high-frequency alternating-field applications, including high electrical resistivity, low coercivity, and simplified alloy chemistry. In this study, the structural, thermal, and magnetic properties of Fe₉₂Si₆C₂ and Fe₉₃Si₆C₁ melt-spun amorphous ribbons were systematically investigated as a first-stage assessment of their AC compatibility. XRD, SEM/EDS, and DSC/TGA analyses confirmed that both compositions exhibit fully amorphous structures with good thermal stability, while Fe₉₂Si₆C₂ demonstrated superior structural uniformity and smoother surface morphology. DC magnetic measurements performed using VSM revealed clear soft-magnetic behavior for both alloys. In particular, Fe₉₂Si₆C₂ exhibited very low coercivity (0.6–0.8 Oe), moderate saturation induction (1.35–1.40 T), high initial permeability (15,000–20,000), and increased electrical resistivity. Combined with the thin ribbon geometry (20–30 μm), these properties are expected to strongly suppress eddy-current formation under alternating magnetic fields. To evaluate practical feasibility, prototype Fe₉₂Si₆C₂ amorphous cores were fabricated and implemented in an industrial electromagnetic contactor, where stable magnetic performance was observed. Although the present study is based on DC magnetic characterization, the obtained structural and magnetic indicators provide a physically grounded basis for predicting favorable AC behavior. The results identify Fe₉₂Si₆C₂ as a promising candidate for high-frequency soft-magnetic components and highlight the broader potential of Fe–Si–C amorphous alloys as alternatives to conventional Fe–Si electrical steels. Future work will focus on frequency-dependent permeability, dynamic hysteresis, and comprehensive AC loss measurements.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147796437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Enhancement of the Curie Temperature in Two-Dimensional Ferrimagnetic Half-Metal (text {CrVX}_{6}) (X = Cl, Br, and I) by Uniaxial Strain 单轴应变对二维铁磁性半金属(text {CrVX}_{6}) (X = Cl, Br, and I)中居里温度的提高
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-25 DOI: 10.1007/s10948-026-07183-y
Xin-Yu Zhang, Min Zhang, Li-Ying Liu, Rui-Ning Wang
{"title":"Enhancement of the Curie Temperature in Two-Dimensional Ferrimagnetic Half-Metal (text {CrVX}_{6}) (X = Cl, Br, and I) by Uniaxial Strain","authors":"Xin-Yu Zhang,&nbsp;Min Zhang,&nbsp;Li-Ying Liu,&nbsp;Rui-Ning Wang","doi":"10.1007/s10948-026-07183-y","DOIUrl":"10.1007/s10948-026-07183-y","url":null,"abstract":"<div>\u0000 \u0000 <p>Two-dimensional (2D) intrinsic magnetic materials have attracted extensive attention in recent years due to their great prospects for future miniature information storage devices. However, their Curie temperatures (<span>(text {T}_{c})</span>) are far below room temperature. Herein, based on first-principles calculations, we propose that 2D evenly-mixed <span>(text {CrVX}_{6})</span> (X = Cl, Br, and I) with good dynamical stabilities are ferrimagnetic half-metals. Compared with the typical insulator <span>(text {CrI}_{3})</span>, <span>(text {T}_{c})</span> of <span>(text {CrVI}_{6})</span> is enhanced by its itinerant electrons and rises to <span>(sim )</span> 122 K. Moreover, a uniaxial strain will break the isotropy of the exchange coupling. Under the uniaxial strain along the zigzag direction, there exists a relation of ‘as one falls, another rises’, i.e. the exchange coupling along the zigzag direction increases but the exchange coupling along the armchair direction decreases. In contrast, a tensile uniaxial strain along the armchair direction is an effective way to further enhance <span>(text {T}_{c})</span>, which may be utilized in future applications.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Data-Driven Superconductivity: a Review of Machine Learning Methods for Material Discovery, Property Prediction, and Process Optimization 数据驱动的超导:材料发现、性能预测和工艺优化的机器学习方法综述
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-24 DOI: 10.1007/s10948-026-07175-y
Muhammad Kashfi Shabdin, Muralidhar Miryala, Mohd Mustafa Awang Kechik, Chen Soo Kien, Lim Kean Pah, Mohd Asyadi Azam
{"title":"Data-Driven Superconductivity: a Review of Machine Learning Methods for Material Discovery, Property Prediction, and Process Optimization","authors":"Muhammad Kashfi Shabdin,&nbsp;Muralidhar Miryala,&nbsp;Mohd Mustafa Awang Kechik,&nbsp;Chen Soo Kien,&nbsp;Lim Kean Pah,&nbsp;Mohd Asyadi Azam","doi":"10.1007/s10948-026-07175-y","DOIUrl":"10.1007/s10948-026-07175-y","url":null,"abstract":"<div><p>Over more than a century following the discovery of superconductors, extensive research has been conducted to leverage their properties, particularly in fundamental materials science applications. Nonetheless, significant challenges still exist that hinder the comprehensive production of superconductors, including the optimal critical temperature (Tc) and current density (Jc), concerns regarding the purity of superconductor phases, sintering temperature, complexities in crystal growth, and various high-cost fabrication-related issues. Recent significant breakthroughs in artificial intelligence (AI) approaches have provided disruptive solutions, such as machine learning (ML), to address these fundamental issues. Thus, ML approaches can be employed to address the issues associated with superconductivity and serve as a means to achieve optimal conditions for superconductors and their applications. ML methodologies can deliver rapid, efficient, and precise solutions for intricate and nonlinear technological, manufacturing, and economic challenges in the domain of superconductivity. This paper initially presents the notion of AI and the often employed ML techniques. A comprehensive conceptual overview is provided for studies employing ML methods aimed at properties enhancement, condition monitoring, and the structural analysis of existing superconductors, along with other pertinent applications. This subject overview is organized into three primary topics: fundamental application utilizing ML, databases used by ML models, and our main focus which is the optimization techniques used alongside with ML in superconductors. Furthermore, the difficulties associated with using ML methodologies in superconductivity and their applications are presented. Ultimately, prospective developments regarding the integration of ML approaches with superconducting for various applications are examined.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147738769","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Pb-free Solders for Joint Developments Between YBCO Tapes 用于YBCO带间接头开发的无铅焊料
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-22 DOI: 10.1007/s10948-026-07159-y
Nooshin Goodarzi, Kévin Berger, Alexander Molodyk, Mark Ainslie, Tayebeh Mousavi
{"title":"Pb-free Solders for Joint Developments Between YBCO Tapes","authors":"Nooshin Goodarzi,&nbsp;Kévin Berger,&nbsp;Alexander Molodyk,&nbsp;Mark Ainslie,&nbsp;Tayebeh Mousavi","doi":"10.1007/s10948-026-07159-y","DOIUrl":"10.1007/s10948-026-07159-y","url":null,"abstract":"<div>\u0000 \u0000 <p>The development of Pb-free solder joints for ReBCO-coated conductors is essential for superconducting magnet manufacturers, who often rely on the Pb-Sn solders that will soon be restricted. This work investigates four low-melting Pb-free eutectic alloys, In<sub>52</sub>Sn<sub>48</sub>, In<sub>66</sub>Bi<sub>34</sub>, Sn<sub>42</sub>Bi<sub>58</sub>, and the ternary In<sub>50</sub>Sn<sub>15</sub>Bi<sub>35</sub>, for fabricating lap joints between YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7−x</sub> (YBCO) tapes. The electrical and mechanical properties, along with the microstructure of the joints, were characterized to identify the optimal Pb-free solder for enhanced electrical and mechanical performance. The choice of solder composition was found to control the microstructure of the solder area and the interface between the tape and the solder, having a substantial impact on the joint’s final performance. Binary eutectic solder joints produced two-phase solder microstructures and thin interfacial intermetallic layers, yielding lower electrical resistance than the ternary eutectic InSnBi alloy, whose three-phase eutectic matrix (γ + β + BiIn₂) increases electron scattering and raises joint resistance. Among the evaluated candidates, the eutectic InBi solder exhibited the best overall performance, combining a uniform microstructure, the lowest joint resistance, and good mechanical strength, positioning it as a promising Pb-free alternative to conventional Pb-Sn solders for superconducting applications. All joints failed outside the solder region during tensile testing at room temperature, indicating that the fabricated solder joints exceeded the mechanical robustness of the original tape. These findings demonstrate that carefully selected Pb-free eutectic solders can produce reliable, low-resistance, and mechanically strong joints suitable for high-field superconducting magnet applications.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-026-07159-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Potential of Tm-Doped GaN: A Comprehensive Study of Magnetic, Optical, and Thermoelectric Properties for Optoelectronic and Energy Conversion Applications tm掺杂GaN的潜力:光电和能量转换应用的磁性、光学和热电性质的综合研究
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-22 DOI: 10.1007/s10948-026-07176-x
F. A. Bensaber, B. Amiri, B. Bouabdallah, I. Bouchama, S. Alomairy, M. A. Ghebouli, M. Fatmi, B. Ghebouli, Mustafa Jaipallah Abdelmageed Abualreish, Aseel Smerat
{"title":"The Potential of Tm-Doped GaN: A Comprehensive Study of Magnetic, Optical, and Thermoelectric Properties for Optoelectronic and Energy Conversion Applications","authors":"F. A. Bensaber,&nbsp;B. Amiri,&nbsp;B. Bouabdallah,&nbsp;I. Bouchama,&nbsp;S. Alomairy,&nbsp;M. A. Ghebouli,&nbsp;M. Fatmi,&nbsp;B. Ghebouli,&nbsp;Mustafa Jaipallah Abdelmageed Abualreish,&nbsp;Aseel Smerat","doi":"10.1007/s10948-026-07176-x","DOIUrl":"10.1007/s10948-026-07176-x","url":null,"abstract":"<div>\u0000 \u0000 <p>This study explores the electronic, thermoelectric (TE), optical, and magnetic properties of thulium-doped gallium nitride (GaN: Tm) using the spin-polarized FP-LAPW method within density functional theory (DFT). Exchange–correlation effects are treated using the GGA + U approach with a Coulomb repulsion parameter of Ueff = 8.76 eV, while the band gap is evaluated using the modified Becke–Johnson (mBJ) potential including spin–orbit coupling. GaN: Tm exhibits a band gap of about 3.16 eV with localized Tm-4f states near the conduction band. Optical calculations reveal enhanced absorption in the visible region with characteristic peaks at 2.6, 3.4, and 4.3 eV, an increased static dielectric constant (~ 7.5), and a blue shift of the absorption edge. A minimum in electrical conductivity is observed near 2.0 eV. Thermoelectric analysis based on Boltzmann transport theory yields a maximum Seebeck coefficient of ~ 248 µV/K and a figure of merit ZT reaching 3.15 at 300 K, indicating improved TE performance compared to pristine GaN. These results demonstrate that Tm doping significantly enhances both the optical response and thermoelectric efficiency of GaN, confirming its potential for optoelectronic and energy-conversion applications. </p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147733093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
First-Principles Investigation of Pressure-Induced Structural, Elastic, Electronic and Thermodynamic Properties of Germanide Compounds RRh2Ge2 (R = Y, La) 压力致锗化合物RRh2Ge2 (R = Y, La)结构、弹性、电子和热力学性质的第一性原理研究
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-15 DOI: 10.1007/s10948-026-07177-w
Fatima Zahraa Djilani, Missoum Radjai, Saber Saad Essaoud, Abdelmadjid Bouhemadou
{"title":"First-Principles Investigation of Pressure-Induced Structural, Elastic, Electronic and Thermodynamic Properties of Germanide Compounds RRh2Ge2 (R = Y, La)","authors":"Fatima Zahraa Djilani,&nbsp;Missoum Radjai,&nbsp;Saber Saad Essaoud,&nbsp;Abdelmadjid Bouhemadou","doi":"10.1007/s10948-026-07177-w","DOIUrl":"10.1007/s10948-026-07177-w","url":null,"abstract":"<div>\u0000 \u0000 <p>This study investigated the impact of pressure on the crystalline structures, elastic properties, electronic and thermal characteristics of the compounds YRh<sub>2</sub>Ge<sub>2</sub> and LaRh<sub>2</sub>Ge<sub>2</sub> to deepen understanding of their fundamental features. We used pseudopotential plane-wave density functional theory to determine the best structural parameters that match experimental results and to examine how pressure, up to 18 GPa, affects crystal size, bond lengths, and the elastic properties of both single-crystal and polycrystalline forms of the studied compounds. Both materials remain elastically stable throughout this pressure range. Three-dimensional visualizations show that Young’s modulus, shear modulus, and linear compressibility vary significantly with the crystallographic directions. The energy band structure spectra and the analysis of the total and partial density of states distribution curves have proven the electronic metallic behavior of the compounds. The obtained thermodynamic properties of RRh<sub>2</sub>Ge<sub>2</sub> (R = Y, La) reveal that they possess low minimum thermal conductivities, moderate thermal expansion coefficients and moderate Debye temperatures, suggest that these materials may be promising candidates for thermal barrier coating applications.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Search for Thermoelectric Material Suitable for Green Energy Applications in Iron-Based Quaternary Heusler Alloy 适于绿色能源应用的铁基四元赫斯勒合金热电材料的研究
IF 1.7 4区 物理与天体物理
Journal of Superconductivity and Novel Magnetism Pub Date : 2026-04-13 DOI: 10.1007/s10948-026-07172-1
John O. Conga, Ondu E. Umana, Nelson O. Nenuwe, Jihad Asad
{"title":"A Search for Thermoelectric Material Suitable for Green Energy Applications in Iron-Based Quaternary Heusler Alloy","authors":"John O. Conga,&nbsp;Ondu E. Umana,&nbsp;Nelson O. Nenuwe,&nbsp;Jihad Asad","doi":"10.1007/s10948-026-07172-1","DOIUrl":"10.1007/s10948-026-07172-1","url":null,"abstract":"<div><p>Alternative sources of clean energy are essential in view of the growing global demand for energy and its impact on the environment. Thermoelectric (TE) technology has been discovered to be the ideal answer to these problems because it can convert heat directly into electricity without producing noise and emitting CO<sub>2</sub>. Fortunately, Heusler compounds have been shown to be good TE materials. Thus, the intention of this investigation is to find material with promising thermoelectric properties that will be suitable for TE applications. Therefore, in this work, the thermoelectric, structural stability, magnetic, optical and electronic properties of FeCrVGa are examined by the density functional theory (DFT) and the BoltzTrap code configured in Wien2k. The results obtained for structural properties reveal that FeCrVGa is stable in the ferromagnetic Y<sup>III</sup>-type. The computed phonon dispersion and formation energy confirm the dynamic stability and possibility of fabricating FeCrVGa by experimental means. Additionally, the modified Becke-Johanson (mBJ) potential is applied to ensure accurate band gap results. The electronic behavior reveals that this material is half-metallic (HM) in nature, with metallic and semiconductor behavior in the spin down and spin up channel. The calculated thermoelectric properties, including electronic <i>zT</i> (= 0.72) at 300 K for FeCrVGa, suggests its suitability for thermoelectric applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-04-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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