Journal of Superconductivity and Novel Magnetism最新文献_第6页

Memory Function of a Three-Dimensional Holstein-Like System

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-30 DOI: 10.1007/s10948-025-06911-0

Zoran Rukelj, Danko Radić, Ivan Kupčić

引用次数: 0

Investigation of the Effect of Low Purity Boron on the Critical Properties of L-IMD MgB2 Wires

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-27 DOI: 10.1007/s10948-025-06917-8

Ö. Çiçek

{"title":"Investigation of the Effect of Low Purity Boron on the Critical Properties of L-IMD MgB2 Wires","authors":"Ö. Çiçek","doi":"10.1007/s10948-025-06917-8","DOIUrl":"10.1007/s10948-025-06917-8","url":null,"abstract":"<div>MgB2/Fe superconducting wires were synthesized by sintering at 850 °C for 2 h using low purity B source by using the Localized Internal Mg Diffusion (LIMD) technique, a type of powder-in-tube method. The formation of locally dense MgB2 regions was targeted with the LIMD technique. In the phase examination of the products by X-ray diffraction, the main phase was determined to be MgB2. Lattice parameters and MgO fraction were determined by the Rietveld refinement process. Microscope and scanning electron microscope images revealed that the core parts contained thin and long structures. Magnetic measurements showed that they exhibited a sharp transition interval, and the magnetic critical current density calculated with the Bean Model was in the order of 105 A/cm2. Pinning force analysis showed that the surface pinning mechanism of the samples was the dominant mechanism. Electrical transport measurements were made using short core samples, and the best resistivity value was obtained in the sample using 86 wt% B source. The transport critical current density values obtained from transport measurements made with long samples at 4.2 K were found to be comparable with the literature. Among the purity levels of 86 wt% and 95 wt% examined in this study, the results of the sample using 86% purity boron were found to be partially improved.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109613","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

Hole-Polarons and Bipolarons in the Extended t − J − V Holstein Model

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-27 DOI: 10.1007/s10948-025-06909-8

Srijani Ghosh, Krishanu Roy, Nanda Kumar Ghosh, Subhadip Nath

{"title":"Hole-Polarons and Bipolarons in the Extended t − J − V Holstein Model","authors":"Srijani Ghosh, Krishanu Roy, Nanda Kumar Ghosh, Subhadip Nath","doi":"10.1007/s10948-025-06909-8","DOIUrl":"10.1007/s10948-025-06909-8","url":null,"abstract":"<div>The Holstein t-J model extended by the nearest-neighbor (NN) hole-phonon (h − ph) interaction ((lambda _2)) and inter-site Coulomb repulsion (V/t) is studied using the exact diagonalization method in the context of high-temperature superconducting cuprates. The exotic physics, characteristics, and stability of polarons and bipolarons are explored. Polarons, large hole bipolarons (LHBP), and Small Hole Bipolarons (SHBP) exist in the Holstein t-J model, depending on the relative strength of the h − ph interaction and inter-site Coulomb repulsion. The role of V/t is to suppress the formation of these hole bipolarons. The transition region from polarons to different types of bipolarons’ is shifted to higher magnitudes of (lambda _2) with the increasing strength of intersite Coulomb repulsion. Moreover, increased phonon energy generally induces the formation of bipolarons. A schematic phase diagram is presented. A single peak in specific heat is observed in the accessible temperature range rising due to charge fluctuations. At low temperatures, the system becomes more ordered above the critical value of (lambda _2) in the anti-adiabatic limit.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109609","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

Tailoring Optical and Magnetic Properties in Mn2+-Substituted 2D Magnetic Semiconductor SnS2: A Powder XRD Approach for Electronic Structure Analysis

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-25 DOI: 10.1007/s10948-025-06908-9

N. Pavithra, M. Charles Robert

{"title":"Tailoring Optical and Magnetic Properties in Mn2+-Substituted 2D Magnetic Semiconductor SnS2: A Powder XRD Approach for Electronic Structure Analysis","authors":"N. Pavithra, M. Charles Robert","doi":"10.1007/s10948-025-06908-9","DOIUrl":"10.1007/s10948-025-06908-9","url":null,"abstract":"<div>A single-phase, two-dimensional layered semiconductor of Mn2+-substituted SnS2 was synthesized using the low temperature and cost-effective hydrothermal method. Powder X-ray diffraction (XRD) analysis revealed a considerable contribution of γ-MnO2 at higher Mn2+ substitution concentrations. An XRD blue shift accounts for Mn2+ substitutions at both substitutional and interstitial sites. Scanning electron microscope (SEM) analysis confirms a two-dimensional disk morphology, containing a large number of nano-crystallites. The electronic structure is visualized using the 3D, 2D, and 1D maximum entropy method (MEM) analysis, such as electron density inside the unit cell, the type and strength of inter- and intra-bonding, and its effect on Mn2+ substitution. In addition to substitutional doping, MEM-based peak search analysis and electron paramagnetic resonance (EPR) studies confirmed interstitial charge accumulation. The 3% Mn2+-substituted composition has superior soft ferromagnetism, with a magnetic saturation of 0.1915 emu/g and coercivity of 174.16 Oe, making it suitable for dilute magnetic semiconductor applications. The mechanism and origin of ferromagnetism are explained based on Mn2+ substitution in substitutional or interstitial sites as well as the concentration of impurity addition γ-MnO2. Optical energy band gap analysis confirms that direct energy gaps are useful for photoactivated catalytic applications. An empirical correlation between magnetic saturation and MEM-based electronic structure is the highlight of the research.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109584","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 Al3+ Doping on the Microstructure and Magnetic Behavior of CoFe2O4 Nanoparticles

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-24 DOI: 10.1007/s10948-024-06892-6

Vaibhav K. Kashte, Vishal Ashok Pandit, Nilkanth N. Kapse, Dinesh Rathod, Bhagwan G. Toksha

{"title":"Effect of Al3+ Doping on the Microstructure and Magnetic Behavior of CoFe2O4 Nanoparticles","authors":"Vaibhav K. Kashte, Vishal Ashok Pandit, Nilkanth N. Kapse, Dinesh Rathod, Bhagwan G. Toksha","doi":"10.1007/s10948-024-06892-6","DOIUrl":"10.1007/s10948-024-06892-6","url":null,"abstract":"<div>This is the study of CoFe2O4 and CoAl0.2Fe1.8O4 ferrite nanoparticles synthesized by sol–gel method, and their structural and magnetic properties with aluminum doping are studied here. Metal nitrates of high purity were used as chelating and polymerization agents along with citric acid and ethylene glycol for the synthesis. The insertion of Al3+ ions into the structure was confirmed by XRD in the present study, where values of lattice parameters decreased and crystallite size decreased. The FT-IR result indicated the same that the Al3+ ions sample has the better metal–oxygen bond. The SEM–EDS results indicated that the addition of Al3+ resulted in finer particles relative to the undoped sample. Saturation magnetization, Ms, was reduced from 80 emu/g to 70 emu/g; Hc was decreased to 650 Oe to 500 Oe; and the anisotropy constant K1 was decreased to 1.2 × 106 erg/cm3 to 9.5 × 105 erg/cm3 from VSM result confirming the lower magnetic hardness due to the Al3+ doping. Based on the study results, it is clear that the dope of the Al3+ donor has a dramatic effect on the properties of ferrite nanoparticles.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109386","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 the Width of Microbridge on the Characteristics of YBCO Step-Edge Josephson Junction

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-24 DOI: 10.1007/s10948-025-06904-z

Sandeep Kumar, Neeraj Khare

{"title":"Effect of the Width of Microbridge on the Characteristics of YBCO Step-Edge Josephson Junction","authors":"Sandeep Kumar, Neeraj Khare","doi":"10.1007/s10948-025-06904-z","DOIUrl":"10.1007/s10948-025-06904-z","url":null,"abstract":"<div>Step-edge grain boundary junctions are fabricated using the pulsed laser-deposited YBa2Cu3O7 (YBCO) film on MgO (100) substrates. Steps with height ~ 400 nm and angle ~ 20° are obtained using photolithography and ion beam etching (IBE) techniques. Microbridges with varying widths, 2, 5, 10, and 20 μm, are fabricated, and their transport properties are studied. A decrease in the critical current and an increase in the normal state resistance of the step-edge junctions are observed with a decrease in the width of the microbridge. The decrease in the Ic is not as sharp as the increase in the Rn value, which leads to the enhanced values of the IcRn product at the reduced width of the microbridge. Critical current density value is found to be maximum for the 2 µm wide junction. Also, the scaling behavior of the IcRn product with Ic and 1/Rn shows that no change in the transport mechanism occurs with change in width of the microbridge. The behavior of all the junctions is superconductor-normal metal-superconductor (SNS) type, as confirmed by the variation of critical current density with the reduced temperature. The IcRn product for the junction with 2 µm wide microbridge obtained at 77 K is 0.4 mV, which makes it a potential candidate for being used as a terahertz detector.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143109387","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

Study of Ferrimagnetic Bond-diluted Ising-like Octahedral and Double Tetrahedral Chains with Multi-spin Interactions

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-24 DOI: 10.1007/s10948-025-06905-y

M. Mouhib, A. El Fadl, S. Bri, H. Mounir, M D. Belrhiti

{"title":"Study of Ferrimagnetic Bond-diluted Ising-like Octahedral and Double Tetrahedral Chains with Multi-spin Interactions","authors":"M. Mouhib, A. El Fadl, S. Bri, H. Mounir, M D. Belrhiti","doi":"10.1007/s10948-025-06905-y","DOIUrl":"10.1007/s10948-025-06905-y","url":null,"abstract":"<div>We herein treat using the finite cluster approximation (FCA), two defective octahedral and double-tetrahedral chain-like structures with multi-spin interactions, where the nodal and the square (or triangular) cluster sites are occupied respectively by spin-3/2 and spin-1/2. The impact of the bond concentration p and the multi-spin interactions (J4, J3) on the phase diagrams and magnetizations has been thoroughly examined. First, by discarding multi-spin interactions, the second-order transition consistently manifests with the possibility of compensation behavior only for the double-tetrahedral chain under feeble dilution. Interestingly, the insertion of multi-spin interactions plays a relevant role in the appearance of the compensation phenomena with a multitude of Tcomp profiles. In addition, a variety of interesting features such as horizontal reentrance and tricritical behavior emerge. Finally, at low temperatures according to p and J4 (or J3) strength, the order is even stable (Tc ≠ 0) or will be destroyed (Tc = 0) at a critical threshold pc.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143108975","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

Indentation Effects on Critical Performance of the New Developed WST High Jc Nb3Sn Strand 压痕对新型WST高Jc Nb3Sn钢绞线临界性能的影响

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-22 DOI: 10.1007/s10948-024-06867-7

Yunhao Liu, Peng Gao, Yu Wu, Arend Nijhuis, Zichuan Guo, Yi Shi, Fang Liu, Chao Dai, Jinggang Qin

{"title":"Indentation Effects on Critical Performance of the New Developed WST High Jc Nb3Sn Strand","authors":"Yunhao Liu, Peng Gao, Yu Wu, Arend Nijhuis, Zichuan Guo, Yi Shi, Fang Liu, Chao Dai, Jinggang Qin","doi":"10.1007/s10948-024-06867-7","DOIUrl":"10.1007/s10948-024-06867-7","url":null,"abstract":"<div>To provide candidate materials for the high-field winding-package (WP) of the toroidal field coil (TF) in next-generation Chinese compact burning plasma tokamak, Western Superconductor Technology Co., Ltd (WST) has newly developed a type of high Jc Nb3Sn wire with restacked-rod process (RRP) of the distributed barrier layout. To avoid the conductor degradation during electromagnetic and thermal cycling, the high-field WP is designed as a short-twist-pitch (STP) cable. After cabling and compaction of conductor, the STP design can cause severe indentation damage to the strands. The indentation not only impact the transport performance of the strand, in the meantime impact the thermo-magnetic stability. To investigate the effect of indentation on the performance for the WST high Jc Nb3Sn strand, series measurements were carried out. In this paper, the critical current (Ic) measurement, residual resistance ratio (RRR) measurement, magnetization measurements, and V-I tests were performed on indented samples, and the results were compared with other two types of high Jc Nb3Sn strands used in high-field WP. It was shown that the critical performance of the samples decreased significantly at an indentation depth of 0.4 mm, and the RRR value decreases with increasing indentation depth.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995603","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

Understanding of Strain Condition Effects on Physical Properties of the Bi2Se3 Compound by the DFT Method 用DFT方法了解应变条件对Bi2Se3化合物物理性质的影响

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-21 DOI: 10.1007/s10948-025-06912-z

A. Jabar, O. Abounachit, S. Idrissi, L. Bahmad

{"title":"Understanding of Strain Condition Effects on Physical Properties of the Bi2Se3 Compound by the DFT Method","authors":"A. Jabar, O. Abounachit, S. Idrissi, L. Bahmad","doi":"10.1007/s10948-025-06912-z","DOIUrl":"10.1007/s10948-025-06912-z","url":null,"abstract":"<div>This study investigated the structural, electronic, optical, thermodynamic, and thermoelectric properties of the Bi2Se3 compound when strains along distinct crystallographic directions. This compound showed a p-type semiconductor nature with a bandgap of 0.77 eV. The anisotropic behavior of the material has also been examined, providing insights into potential applications in various fields. We employed the density functional theory (DFT) under the Wien2k package. The calculations utilized the LSDA (local spin density approximation) and mBJ (modified Becke-Johnson) local density approximation functionals to handle exchange–correlation interactions. The study covered a range of characteristics, including heat capacity, Debye temperature, lattice thermal conductivity, and optical properties including the absorption coefficient, the electron energy loss, the refractive index, and the optical conductivity as well as the dielectric tensor’s real and imaginary components. The thermoelectric properties including the Seebeck coefficient, electrical conductivity, electronic contribution to thermal conductivity, and calculated power factors have been deduced and discussed.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995514","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 DFT Study on the Effects of Changing Transition Metals (Fe, Ru and Os) in Neodymium Phosphide Skutterudites NdTr4P12: Structural, Elastic, Thermodynamic, Electronic, Magnetic, Optical and Thermoelectric Properties 改变过渡金属（Fe， Ru和Os）对磷化钕晶矿NdTr4P12结构、弹性、热力学、电子、磁性、光学和热电性能影响的DFT研究

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-21 DOI: 10.1007/s10948-025-06913-y

Tanmay Chaki, Pradip Kumar Mandal

{"title":"A DFT Study on the Effects of Changing Transition Metals (Fe, Ru and Os) in Neodymium Phosphide Skutterudites NdTr4P12: Structural, Elastic, Thermodynamic, Electronic, Magnetic, Optical and Thermoelectric Properties","authors":"Tanmay Chaki, Pradip Kumar Mandal","doi":"10.1007/s10948-025-06913-y","DOIUrl":"10.1007/s10948-025-06913-y","url":null,"abstract":"<div>Several important ground state properties—structural, elastic, thermodynamic, electronic, magnetic, optical, and thermoelectric properties—of three neodymium-filled skutterudites NdTr4P12 (Tr = Fe, Ru, and Os) have been investigated using PBE-GGA exchange-correlation potential under the DFT method and Boltzmann transport theory. The effect of changing transition metals on these properties has been explored. Some of the physical parameters increase systematically with increasing atomic number (z) of the transition metals, while some other parameters exhibit a reverse trend. Although the band structure and DOS reveal their metallic nature, near the Fermi level total DOS are different in both spin channels. The materials are ferromagnetic and the magnetic moment of the compounds increases with z. The static dielectric constants also increase with z whereas the refractive indices in the optical frequency range decrease with z. The materials have high reflectivity and low absorption near the Fermi level and within the 0 – 5 eV spectral range, metal-insulator-metal type transition is seen in all. The thermoelectric figure of merit (ZT) increases fast with temperature but shows no systematic variation with z. In the high temperature range NdOs4P12 shows the maximum ZT value, followed by the ruthenium and iron compounds.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995515","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