Journal of Superconductivity and Novel Magnetism最新文献_第4页

Impact of Fe Doping on Ferroelectric and Ferromagnetic Properties of Barium Titanate 铁掺杂对钛酸钡铁电和铁磁性能的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-25 DOI: 10.1007/s10948-026-07219-3

Smita More, Mangesh V. Khedkar, Pravin Kadhane, Rahul Kambale, V. R. Bhagwat, K. M. Jadhav

{"title":"Impact of Fe Doping on Ferroelectric and Ferromagnetic Properties of Barium Titanate","authors":"Smita More, Mangesh V. Khedkar, Pravin Kadhane, Rahul Kambale, V. R. Bhagwat, K. M. Jadhav","doi":"10.1007/s10948-026-07219-3","DOIUrl":"10.1007/s10948-026-07219-3","url":null,"abstract":"<div>The present work aims to induce ferromagnetism via. Fe3+ doping in barium titanate pervoskite. Iron (Fe) doped barium titanate BaTi1−xFexO3 (x = 0.05, 0.15, 0.25) series of nanoparticles were prepared by the sol-gel self-ignition method. The X-ray diffraction (XRD) analysis reveals the phase formation and lattice symmetries. The tetragonal structure was observed for composition (x = 0.05) whereas the remaining two compositions i.e., x = 0.15 and 0.25 shows a hexagonal structure. Infrared spectra of all three samples show the presence of two main absorbance bands at around 500 cm− 1 and 1450 cm− 1. The surface morphology of the typical sample (x = 0.25) was studied through FE-SEM. The DC electrical resistivity was found to decrease with temperature obeying the Arrhenius relations. The BaTi1−xFexO3 (x = 0.05, 0.15, 0.25) system revealed the multiferroic nature by showing polarization and magnetization to an externally applied electric and magnetic field having dependent hysteresis behavior respectively. Thus, the present BaTi1−xFexO3 (x = 0.05, 0.15, 0.25) ceramic system may be useful for developing multiferroic multifunctional devices.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148614171","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

Considerable Magnetocaloric Effects of Dysprosium-Doped Gadolinium Phosphate Compounds 掺镝磷酸钆化合物的可观磁热效应

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-22 DOI: 10.1007/s10948-026-07218-4

Jieyang Fang, Yiwen Ding, Lei Zhou, Xiukun Hu, Qiong Wu, Hangfu Yang, Hongliang Ge

{"title":"Considerable Magnetocaloric Effects of Dysprosium-Doped Gadolinium Phosphate Compounds","authors":"Jieyang Fang, Yiwen Ding, Lei Zhou, Xiukun Hu, Qiong Wu, Hangfu Yang, Hongliang Ge","doi":"10.1007/s10948-026-07218-4","DOIUrl":"10.1007/s10948-026-07218-4","url":null,"abstract":"<div>The Gd3+/Dy3+ co-doping compounds of Gd(1 – x)DyxPO4 (x = 0, 0.1, and 0.2) were synthesized via chemical precipitation and solid-state reaction. The crystal structures, phase transition temperatures, maximum value of the magnetic entropy changes (−ΔSMax M), and relative cooling powers have been investigated. X-ray diffraction revealed that the samples exhibited monoclinic crystal structures with the P21/n space group. The magnetization measurements revealed that the samples underwent second-order ferromagnetic-paramagnetic transitions, and the transition temperature decreased with increasing Dy content. Under the magnetic field of 50 kOe, large −ΔSMax M values of 50.1, 43.7, and 41 J/kg K were obtained at a temperature close to the liquid helium temperature. As the Dy content increased, the RCP and TEC(2) were significantly improved. The considerable MCEs suggest that these compounds can be used in the development of low-temperature magnetic refrigeration materials.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613612","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

Theoretical Analysis of the Rare-Earth Dicarbides REC2 (RE = Ce, Pr, Nd, Sm, Gd and Dy), in CaC2-Structure 稀土二碳化物REC2 （RE = Ce, Pr, Nd, Sm， Gd和Dy）在cac2结构中的理论分析

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-21 DOI: 10.1007/s10948-026-07224-6

Safi Ullah, Zahid Ali, Israr Ahmad, Saif Ullah, Hamad Ali, Mazhar Ali

{"title":"Theoretical Analysis of the Rare-Earth Dicarbides REC2 (RE = Ce, Pr, Nd, Sm, Gd and Dy), in CaC2-Structure","authors":"Safi Ullah, Zahid Ali, Israr Ahmad, Saif Ullah, Hamad Ali, Mazhar Ali","doi":"10.1007/s10948-026-07224-6","DOIUrl":"10.1007/s10948-026-07224-6","url":null,"abstract":"<div>Rare-earths dicarbides REC2 (RE = Ce, Pr, Nd, Sm, Gd and Dy) in CaC2-type structure are investigated through density functional theory (DFT). The understudy dicarbides are highly correlated electron systems because of the 4f orbital of RE atoms. To treat these systems, exchange correlation functional generalized gradient approximation along with Hubbard U (GGA + U) is utilized. The phonon spectra confirm the dynamic stability of these carbides and the calculated lattice parameters are found to be in closed agreement with the existing experimental data. The magnetic ground state optimization energies demonstrate that all these carbides are stable in antiferromagnetic (AFM) phase. The electron charge density plots and electronegativity difference on Pauling scale confirm the covalent between rare-earth ion (RE+ 3) and acetylide ion C2. All of these carbides’ electronic properties in the AFM phase reveal their metallic nature. The ductility of all these intermetallics is revealed by the elastic parameters. All these carbides possess intermediate Vickers’s hardness confirming their moderately hard nature. Based on the physical properties of these dicarbides like moderate hardness, high temperature strength and metallic nature it is expected that they could be considered as a suitable candidate for high temperature applications provided they are adequately shielded from atmospheric moisture.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613732","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

Influence of Thickness and Ta Buffer Layer on the Magnetic Properties of TbFeCo Thin Films 厚度和Ta缓冲层对TbFeCo薄膜磁性能的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-21 DOI: 10.1007/s10948-026-07221-9

Fatime Gulsah Akca, Osman Karlioglu, Eyup Duman, Halime Gul Yaglioglu

{"title":"Influence of Thickness and Ta Buffer Layer on the Magnetic Properties of TbFeCo Thin Films","authors":"Fatime Gulsah Akca, Osman Karlioglu, Eyup Duman, Halime Gul Yaglioglu","doi":"10.1007/s10948-026-07221-9","DOIUrl":"10.1007/s10948-026-07221-9","url":null,"abstract":"<div>We systematically investigated the magnetic properties of TbFeCo thin films as a function of thickness between 17 and 34 nm, with and without a Ta buffer layer, focusing on anisotropy behavior and magnetic compensation effects. Films grown on thermally oxidized SiO2/Si substrates without Ta buffer layer exhibit pronounced perpendicular magnetic anisotropy (PMA), which is attributed to strain-induced effects associated with surface roughness induced by the substrate. Across both series, the out-of-plane magnetization remains higher than the in-plane response, and the minimum saturation magnetization occurs at intermediate thicknesses, suggesting proximity to a thickness-driven magnetic compensation regime. Notably, the compensation-like minimum appears at significantly greater thicknesses than values reported for films grown on other substrates, indicating that thermally oxidized Si shifts the effective compensation thickness beyond 24 nm. These findings highlight the crucial role of substrate interface and structural morphology in tailoring the magnetic anisotropy and compensation behavior of TbFeCo thin films for spintronic applications.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613726","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

Electrical, Magnetic, Photocatalytic, and Structural Properties of Ni and Ce Substituted Magnesium Nano Ferrites: A Citrate Gel Auto-Combustion Approach 镍和铈取代镁纳米铁氧体的电、磁、光催化和结构性质：柠檬酸凝胶自燃烧方法

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-20 DOI: 10.1007/s10948-026-07223-7

Bathini Srinivas, Marri Pradeep Kumar, Savita Belwal, Koteswararao P, D. Ravi Kumar

{"title":"Electrical, Magnetic, Photocatalytic, and Structural Properties of Ni and Ce Substituted Magnesium Nano Ferrites: A Citrate Gel Auto-Combustion Approach","authors":"Bathini Srinivas, Marri Pradeep Kumar, Savita Belwal, Koteswararao P, D. Ravi Kumar","doi":"10.1007/s10948-026-07223-7","DOIUrl":"10.1007/s10948-026-07223-7","url":null,"abstract":"<div>A series of Ni and Ce co-doped magnesium ferrite nano materials with composition Mg1−xNixCeyFe2−yO4 (where y = x= 0.00, 0.025, 0.050, 0.075 and 0.1) were synthesized via a low temperature citrate gel auto combustion method. The PXRD (powder X-ray diffraction) confirmed single phase spinel structures with crystalline size in the ranges of 20.16 nm to 25.28 nm. The morphological studies and particle size distribution of the materials examined by scanning electron microscope. The samples spinel structure verified by FTIR absorption bands at both sites tetrahedral and octahedral. The optical band gap energies varied from 1.705 to 2.191 eV, with the minimum value (1.705 eV) observed for Mg0.925Ni0.075Ce0.075Fe1.925O4 indicating enhanced visible absorption. Magnetic measurements showed ferrimagnetic behaviour with saturation magnetization decreased from 15.35 to 10.42 emu/g with increasing dopant content. The photocatalytic activity was investigated through organic effluents methylene blue and acid red and the results demonstrated that Mg0.95Ni0.05Ce0.05Fe1.95O4 showed the highest degradation activity, reaching about 50% after 75 min for acid red. Dielectric properties like AC conductivity, Dielectric constant and impedance spectrum were analysed by LCR meter at various temperature and frequencies. The scientific novelty of this research lies in the systematic incorporation of Ni and Ce ions into the MgFe2O4 lattice, providing a new strategy for tailoring the physicochemical properties of magnesium nanoferrites.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148613568","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

Effect of Annealing Time and Compaction Pressure on the Microstructure and Magnetic Properties of Fe-5wt%Al Soft Magnetic Composite 退火时间和压实压力对Fe-5wt%Al软磁复合材料组织和磁性能的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-18 DOI: 10.1007/s10948-026-07217-5

Rajeeth Kumar R., Jeevanantham A. K.

{"title":"Effect of Annealing Time and Compaction Pressure on the Microstructure and Magnetic Properties of Fe-5wt%Al Soft Magnetic Composite","authors":"Rajeeth Kumar R., Jeevanantham A. K.","doi":"10.1007/s10948-026-07217-5","DOIUrl":"10.1007/s10948-026-07217-5","url":null,"abstract":"<div>Fe-5 wt% Al soft magnetic composites (SMCs) were prepared through powder blending, compaction, sintering, and annealing. The uniaxial compaction pressures of 200, 250, and 300 kN were used to form green compacts with the relative densities of 82, 85, and 89%, respectively. The green compacts were pre and post-sintered at 600 °C and 1200 °C. Then the post-sintered compacts were annealed at 800 °C for 1 and 2 h. The effect of annealing time on the microstructure and soft magnetic properties was investigated using XRD, FE-SEM, and VSM. Annealing Fe-5 wt%Al SMC increased the saturation magnetization by relieving internal stress. Adding 5 wt% Al enhanced the recrystallization in compacts by reducing the crystalline size. The stress relief and crystal rearrangement in the compacts were enhanced by increasing the annealing time from 1 to 2 h. Through annealing, a high saturation magnetization (Ms) was recorded in the range of 194.05 to 212.67 emu/g. Also, the low remanence magnetization (Mr) was recorded in the range of 0.41 to 1.49 emu/g due to stress relief in the compacts. The diffusion of porous oxygen and Al in the compacts increased the coercivity(Hc) from 22.88 to 32.17 Oe. Eventually, the decrease in crystalline size reduced the hardness of the compacts. Cold sintering process reducess the Ms of the compacts deveoped after sintering due to the high internal stress in the compacts after compaction. But the annealing after sintering enhanced the Ms of the compacts. When compared to the high Ms of other processing technique the Ms recorded by this work have increased in the range of 4.63–13.01%.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466506","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

Optical Properties of Iron-Selenide Na(_{0.27})K(_{0.27})Rb(_{0.27})Fe(_{1.7})Se(_2) Single Crystals 硒化铁Na (_{0.27}) K (_{0.27}) Rb (_{0.27}) Fe (_{1.7}) Se (_2)单晶的光学性质

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-16 DOI: 10.1007/s10948-026-07222-8

Andrei Muratov, Yevgeny Rakhmanov, Andrei Shilov, Igor Morozov, Yurii Aleshchenko

{"title":"Optical Properties of Iron-Selenide Na(_{0.27})K(_{0.27})Rb(_{0.27})Fe(_{1.7})Se(_2) Single Crystals","authors":"Andrei Muratov, Yevgeny Rakhmanov, Andrei Shilov, Igor Morozov, Yurii Aleshchenko","doi":"10.1007/s10948-026-07222-8","DOIUrl":"10.1007/s10948-026-07222-8","url":null,"abstract":"<div>With infrared Fourier-transform spectroscopy and spectroscopic ellipsometry we investigated the in-plane reflectance of the superconducting Na(_{0.27})K(_{0.27})Rb(_{0.27})Fe(_{1.7})Se(_2) single crystals with a critical temperature (T_capprox 34.3) K over a broad frequency range at temperatures of 4–300 K. The normal-state response of Na(_{0.27})K(_{0.27})Rb(_{0.27})Fe(_{1.7})Se(_2) is analyzed by a Drude-Lorentz model with one Drude component. The temperature dependences of the plasma frequency, optical conductivity, scattering rate, and dc resistivity of the Drude component in the normal state are presented. We report a Fano-shaped mode at 1430 cm(^{-1}) indicating a coupling of the discrete mode presumably related to some electronic transition to a two-magnon continuum as well as a low-frequency broad band assigned to the acoustic magnon branch of the antiferromagnetic superstructure. These features persist in the reflectance in both the normal and superconducting states suggesting a mesoscopic coexistence of superconductivity and magnetism in Na(_{0.27})K(_{0.27})Rb(_{0.27})Fe(_{1.7})Se(_2).</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148466324","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

Developing Sustainable Spintronics: Investigating Mn-Based Zintl Semiconductors for Next-Gen Devices 发展可持续的自旋电子学：研究下一代器件的mn基Zintl半导体

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-15 DOI: 10.1007/s10948-026-07210-y

Uzma Hameed, Hayat Ullah, Mohja Jaouadi, Syed Zeshan Abbas, Arafa A. Yagob, Saida Mohammad Zribi, Solima I. Yagoob

{"title":"Developing Sustainable Spintronics: Investigating Mn-Based Zintl Semiconductors for Next-Gen Devices","authors":"Uzma Hameed, Hayat Ullah, Mohja Jaouadi, Syed Zeshan Abbas, Arafa A. Yagob, Saida Mohammad Zribi, Solima I. Yagoob","doi":"10.1007/s10948-026-07210-y","DOIUrl":"10.1007/s10948-026-07210-y","url":null,"abstract":"<div>Zintl antiferromagnetic semiconductors are promising for renewable energy and spintronic technologies due to their unique properties. This study presents a first-principles investigation on the structural, electronic, and magnetic properties of EuMn₂X₂ (X = P, As, Sb) Zintl phase compounds. Structural parameters were computed using the PBE-GGA functional, while the electronic and magnetic properties were refined with GGA + U. Each compound crystallizes in a trigonal structure (space group P3ˉm1), with stability confirmed by negative formation energies. Structural analysis indicates antiferromagnetic behavior with the lowest ground state energies. Electronic band structures predict a semiconducting nature with tunable band gaps of approximately 0.210, 0.203, and 0.163 eV for EuMn₂P₂, EuMn₂As₂, and EuMn₂Sb₂, respectively, in spin-up ferromagnetic configurations. Calculated lattice constants, bulk modulus, pressure derivatives, and band gap for EuMn₂P₂ agree well with experimental data, validating our calculations. The antiferromagnetic ground state is stabilized by robust superexchange interactions, with Mn moments ranging from 2.6 to 4.8 µB. The band gap decreases systematically from P to Sb due to increased Mn–X bond lengths. The arsenide and antimonide compounds exhibit higher Néel temperatures, indicating enhanced thermodynamic stability. These findings provide a detailed understanding of the magnetic and electronic properties of EuMn₂X₂ (X = P, As, Sb) Zintl compounds, establishing a foundation for their potential consideration in spintronic applications.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465719","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

Anisotropic Magnetic Phase Transition in a New Antiferromagnet Single Crystal of N-EuAgBi 新型反铁磁体N-EuAgBi单晶的各向异性磁相变

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-14 DOI: 10.1007/s10948-026-07220-w

Congbin Liu, Shishi Ma, Zexiang Liu, Xuechao He, Jiangdong Wang, Sujuan Jin, Hongyan Zhou, Liang Li, Hao Shi, Yongsong Luo, Junbao He

{"title":"Anisotropic Magnetic Phase Transition in a New Antiferromagnet Single Crystal of N-EuAgBi","authors":"Congbin Liu, Shishi Ma, Zexiang Liu, Xuechao He, Jiangdong Wang, Sujuan Jin, Hongyan Zhou, Liang Li, Hao Shi, Yongsong Luo, Junbao He","doi":"10.1007/s10948-026-07220-w","DOIUrl":"10.1007/s10948-026-07220-w","url":null,"abstract":"<div>We report a discovery of a new antiferromagnet EuAgBi (N-EuAgBi), which crystallizes in hexagonal space group P63/mmc (No. 194) in ZrBeSi-type structure with two Ag atoms occupying the same site. Magnetic susceptibility and specific heat reveal two antiferromagnetic orders of Eu developing at TN1= 5.4 K and TN2= 4.9 K. However, below the antiferromagnetic transition temperature of TN1, magnetic susceptibility shows an additional phase transition for the ab plane. Two successive magnetic phases in the presence of the magnetic field along the ab plane are observed, which is not observed when magnetic field is applied along the c axis. Those results imply that some modification of band structure induced by Ag atoms are responsible for the appearance of magnetic phases and anisotropy. Therefore, N-EuAgBi is a unique hexagonal structure antiferromagnet with complex crystal structure and field-induced magnetic phase.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465805","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

Performance Evaluation of NbTi Superconducting Joints Fabricated by Mechanical Pressing for Persistent Current Mode Operation 持续电流模式下机械压制NbTi超导接头的性能评价

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-07-08 DOI: 10.1007/s10948-026-07215-7

Hyun Sung Noh, Minkyu Sun, Younghoon Kim, Mtangi Mohamed Mussa, Haigun Lee

{"title":"Performance Evaluation of NbTi Superconducting Joints Fabricated by Mechanical Pressing for Persistent Current Mode Operation","authors":"Hyun Sung Noh, Minkyu Sun, Younghoon Kim, Mtangi Mohamed Mussa, Haigun Lee","doi":"10.1007/s10948-026-07215-7","DOIUrl":"10.1007/s10948-026-07215-7","url":null,"abstract":"<div>A mechanical pressing technique to join multifilament niobium-titanium (NbTi) superconducting wires is proposed and experimentally verified. The fabricated joints enable superconducting magnets to operate in persistent current mode without conventional solder joints. Finite element analysis (FEA) was used to design a copper mold capable of withstanding compressive forces of up to 14 tons without mechanical failure. Two NbTi wires with diameters of 0.7 mm and 0.9 mm were prepared by chemically etching the copper matrix at the wire ends, after which the ends were mechanically compressed by applying different loads (10, 12, and 14 tons) to join the wires. Electrical characterization at 4.2 K showed that compression under high pressure significantly improved the superconducting performance. The critical current of the joints increased from ~ 10 A at 10 tons to ~ 140 A at 14 tons, and the n-value (current-voltage index) rose from ~ 3 to ~ 32. Cross-sectional scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) revealed that, at 14 tons, the NbTi filaments of the two wires were highly consolidated without intervening copper, whereas at lower pressures, the filament boundaries were clearly visible. These results demonstrate that NbTi joints compressed under appropriate conditions can achieve superconducting properties suitable for sustainable magnet operation. The joint fabrication technique based on mechanical compression provides an alternative to solderless NbTi superconductor joints and, subject to further optimization, is potentially applicable to magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) magnets.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148465167","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