Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Structural, Dielectric, Magnetic, and Magnetoelectric Properties of Lead-Free BCZT– CZFO Composite Ceramics","authors":"Dnyaneshwar N. Mandve,&nbsp;Namdeo N. Waghule","doi":"10.1007/s10948-026-07212-w","DOIUrl":"10.1007/s10948-026-07212-w","url":null,"abstract":"<div><p>Lead-free multiferroic composites comprising Ba₀.₉Ca₀.₁Zr₀.₂Ti₀.₈O₃ (BCZT), Co₀.₈Zn₀.₂Fe₂O₄ (CZFO), and their composites 0.75BCZT–0.25CZFO and 0.65BCZT–0.35CZFO were synthesized using a conventional solid-state ceramic route. X-ray diffraction confirmed the coexistence of phase-pure perovskite BCZT and spinel CZFO structures without secondary phases. Electrical resistivity measurements revealed semiconducting behaviour with a negative temperature coefficient of resistance. Dielectric studies showed strong low-frequency dispersion and reduced dielectric loss at higher frequencies, consistent with the Maxwell–Wagner interfacial polarization mechanism. Magnetic characterization demonstrated soft ferrimagnetic behaviour for CZFO-containing samples, while BCZT exhibited negligible magnetization. The present work establishes a systematic correlation between phase composition, dielectric response, electrical transport, magnetic softness, and magnetoelectric coupling. Among the investigated compositions, 0.65BCZT–0.35CZFO exhibited the highest magnetoelectric coefficient due to optimized interfacial strain transfer, highlighting its potential as an environmentally friendly multifunctional material for magnetoelectric applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380205","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}

{"title":"Effect of Decorating NiO Nanoparticles on Superconducting Properties of YBCO","authors":"Denis Gokhfeld,&nbsp;Sergey Semenov,&nbsp;Mikhail Petrov,&nbsp;Ivan Nemtsev,&nbsp;Maksim Molokeev,&nbsp;Viktor Kirillov,&nbsp;Oleg Martyanov","doi":"10.1007/s10948-026-07214-8","DOIUrl":"10.1007/s10948-026-07214-8","url":null,"abstract":"<div><p>The influence of adding 23 nm NiO nanoparticles on the magnetic hysteresis loops and critical current density of the high-temperature superconductor YBa₂Cu₃O_7–δ has been investigated. The samples were prepared using a short-time annealing method that prevents chemical interaction between the components and does not reduce the critical temperature of the superconductor. Compared to the undoped YBCO sample, the critical current density increases in the samples doped with NiO nanoparticles in magnetic fields greater than 0.6 T. The sample containing 0.5 weight% of NiO nanoparticles exhibits the greatest enhancement in critical current density at 1 T (1.36 times greater than the undoped sample).</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380674","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}

{"title":"Macroscopic Quantum Tunneling in Superconducting Junctions: Theoretical Aspects","authors":"Andrei D. Zaikin","doi":"10.1007/s10948-026-07204-w","DOIUrl":"10.1007/s10948-026-07204-w","url":null,"abstract":"<div><p>Theoretical aspects of the phenomenon of macroscopic quantum tunneling (MQT) in superconducting weak links are reviewed. This review includes both the \"standard\" theory of MQT in Josephson tunnel junctions in the presence of dissipation and further extensions of this theory embracing highly transparent superconducting junctions with intrinsic dissipation due to the presence of low energy Andreev bound states. The latter structures demonstrate a number of interesting specific features which are still waiting for their experimental confirmation.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148380531","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}

{"title":"Phase Diagrams and Magnetic Compensation Behavior of Blume Caple Model in Core–shell Structure (1, 3/2) with Monte Carlo Simulation","authors":"A. Lahbibi,&nbsp;S. Harir,&nbsp;A. Elidrysy,&nbsp;Z. Elmghabar,&nbsp;R. Lahlimi,&nbsp;Y. Lghazi,&nbsp;Y. Boughaleb","doi":"10.1007/s10948-026-07211-x","DOIUrl":"10.1007/s10948-026-07211-x","url":null,"abstract":"<div><p>Using Monte Carlo simulations, we investigate the phase diagrams and magnetic compensation behavior of a ferrimagnetic Blume-Capel nanowire with a core–shell structure and mixed spins (<span>(s=1)</span>,<span>(sigma =3/2)</span>). The model is characterized by three exchange coupling constants (<span>({J}_{c})</span>,<span>({J}_{s})</span>, <span>({J}_{cs})</span>​) and an average crystal field<span>(D)</span>. Exact ground-state calculations at zero temperature reveal a rich variety of phases, including a ferromagnetic phase under specific conditions. The analysis of local magnetic properties highlights a compensation phenomenon, which is of paramount importance for technological applications such as thermo-optical recording. In particular, the compensation temperature is influenced by both the crystal field and the exchange coupling constants. Additionally, the study of the hysteresis cycle reveals the presence of multiple loops, whose structure depends on these parameters, thus illustrating a distinctive multi-loop hysteresis behavior.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148381026","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}

{"title":"Magnetic Characteristic and Phase Transition Properties of Provskite Manganite (text {La}_{0.8}text {Sr}_{0.2}text {MnO}_{3})","authors":"Yihan Zhang,&nbsp;Zhen Xu,&nbsp;Hao Liu,&nbsp;Chunlan Ma,&nbsp;Caixia Wang,&nbsp;Lei Zhang,&nbsp;Yu-E Yang,&nbsp;Yan Zhu,&nbsp;Jiyu Fan","doi":"10.1007/s10948-026-07213-9","DOIUrl":"10.1007/s10948-026-07213-9","url":null,"abstract":"<div><p>We studied the magnetic and phase transition properties of perovskite manganites <span>(text {La}_{0.8}text {Sr}_{0.2}text {MnO}_{3})</span>. A ferromagnetic-paramagnetic phase transition was confirmed at T<span>(_{C})</span>=316 K by the measurement of the temperature-dependent magnetization M(T). Arrott plots show that this phase transition is of second order. Using the modified Arrott plots and Kouvel-Fisher method, the critical exponents are determined as <span>(beta )</span>=0.594 for the spontaneous magnetization and <span>(gamma )</span>=0.930 for the initial susceptibility, while <span>(delta )</span>=2.660 obtained from the critical isotherm at T<span>(_{C})</span> agrees well with that extracted from the Widom scaling relation. Within the long-range interaction framework, the decay exponent <span>(sigma approx 1.312)</span> in J(r) <span>(sim )</span> r<span>(^{-(d+sigma )})</span> was evaluated. These results indicate that the phase transition of <span>(text {La}_{0.8}text {Sr}_{0.2}text {MnO}_{3})</span> belongs to a three-dimensional one-component system with long-range ferromagnetic interactions, close to a mean-field-like universality class. This work provides useful insight into the range of spin-spin interactions and critical behavior in doped manganites.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148381058","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}

{"title":"Investigation of Low Temperature Magneto-Caloric, Dielectric, and Electrical Properties of Gadolinium (Gd) Modified DyMnO3","authors":"Krishnamayee Bhoi,&nbsp;Alok Barik,&nbsp;Hari Sankar Mohanty,&nbsp;Kumar Ajay,&nbsp;Dillip K. Pradhan,&nbsp;Snehlata Aggarwal","doi":"10.1007/s10948-026-07209-5","DOIUrl":"10.1007/s10948-026-07209-5","url":null,"abstract":"<div><p>The gadolinium (Gd) doped DyMnO₃ (Dy_0.9Gd_0.1MnO₃) was prepared by acrylamide-based gel template technique. The structural, specific heat, dielectric, electrical and magneto-dielectric properties of Dy_0.9Gd_0.1MnO₃ were investigated in this report. The XRD analysis shows characteristics peak corresponding to orthorhombic structure. The field emission scanning electron microscopy (FESEM) suggests formation of polyhedral grains with minute amount of pores. The variation of specific heat with temperature was measured at different magnetic fields. The specific heat versus temperature plot shows three distinct anomalies corresponding to T_N(Dy), T_lock and T_N(Mn). The effect of magnetic field on these transitions and magneto-caloric property of Dy_0.9Gd_0.1MnO₃ were investigated in detail. The dielectric properties of Dy₀.₉Gd₀.₁MnO₃ as functions of temperature and frequency were systematically examined. The electrical properties of the material were studied using complex impedance spectroscopy. The value of activation energy was calculated to be around 90 meV suggesting involvement of polaron in the conduction process. The magneto-dielectric response around the magnetic transition temperatures was analyzed. The magnetic field dependence of specific heat suggests its possible use in magnetic refrigeration and fuel industry at low temperature (2–50 K).</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148285476","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}

{"title":"Magnetic Properties and Phase Transformations of Cu57Ni15Sn8Mn20 Alloy at Different Annealing Temperatures","authors":"Zhixing Gao,&nbsp;Mingyang He,&nbsp;Tian Zhang,&nbsp;Shuotong Zong,&nbsp;Yan Zhang,&nbsp;Yafei Kuang,&nbsp;Fenghua Chen,&nbsp;Zhengyi Jiang","doi":"10.1007/s10948-026-07207-7","DOIUrl":"10.1007/s10948-026-07207-7","url":null,"abstract":"<div><p>This study presents a systematic investigation of the magnetic properties and phase transitions in a Cu₅₇Ni₁₅Sn₈Mn₂₀ alloy subjected to various annealing temperatures. X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM) analyses demonstrate that the precipitation of distinct phases is contingent upon the annealing temperature. Room-temperature crystal structure analysis was conducted using XRD. Microstructure observation and elemental composition testing were performed via SEM coupled with EDS. Additionally, the magnetic and electrical properties of the samples were characterized by VSM. Thermomagnetic (M-T) and isothermal magnetization (M-H) curves indicate that the magnetic properties of the alloy are markedly enhanced with decreasing annealing temperature. The alloy annealed at 873 K exhibits a room-temperature magnetization of approximately 14.5 emu/g, along with a Curie temperature (T_<i>C</i>) of approximately 350 K measured under an applied field of 1 kOe. Alloys annealed at 873 K exhibit low resistivity and excellent electrical conductivity. Hardness testing shows that annealing alleviates internal stresses, leading to a reduction in Vickers hardness. The imaginary component and phase of the AC magnetic susceptibility also exhibit a dependence on the annealing temperature. The present study demonstrates that the annealing temperature critically governs the magnetic properties and phase transitions in the Cu₅₇Ni₁₅Sn₈Mn₂₀ alloy. Through precise temperature modulation, these properties can be controllably tailored, thereby establishing a systematic methodology for investigating magnetic Cu-based alloys.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237241","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}

{"title":"Thermodynamic Signatures of Interband Coupling in Multiband Superconductors: A Self-Consistent Two-Gap Analysis","authors":"Orifjon Ganiev,&nbsp;Zakhriddin Rakhmonov","doi":"10.1007/s10948-026-07208-6","DOIUrl":"10.1007/s10948-026-07208-6","url":null,"abstract":"<div><p>Thermodynamic and magnetic measurements serve as primary probes for determining the superconducting gap structure in complex materials. A pervasive method for analyzing such data is the phenomenological single-gap <span>(alpha )</span>-model, which adjusts the coupling strength <span>(alpha = varDelta (0)/k_B T_c)</span> to fit deviations from the BCS weak-coupling limit. However, this approach inherently neglects interband scattering, a microscopic mechanism essential for thermodynamically locking distinct Fermi surface sheets to a single critical temperature. In this work, we present a comparative theoretical analysis of the electronic specific heat and the lower (<span>(H_{c1})</span>) and upper (<span>(H_{c2})</span>) critical magnetic fields calculated within the <span>(alpha )</span>-model versus the microscopic self-consistent two-gap model derived via the Bogoliubov-Valatin transformation. By applying both frameworks to iron-based superconductors – including LiFeAs, Ba(Fe<span>(_{1-x})</span>TM<span>(_x)</span>)<span>(_2)</span>As<span>(_2)</span> (TM = Co, Ni), and SmFeAsO<span>(_{0.9})</span>F<span>(_{0.1})</span> – as well as the noncentrosymmetric superconductor BeAu, we demonstrate that neglecting interband coupling leads to fundamental physical inconsistencies. Specifically, we show that the anomalous specific heat shapes often observed (suppressed jumps and low-temperature humps), alongside the distinct multi-scale curvatures and low-temperature saturation plateaus in <span>(H_{c1})</span> and <span>(H_{c2})</span>, are natural thermodynamic consequences of \"passive\" bands where superconductivity is induced via the proximity effect in momentum space. We conclude that while the <span>(alpha )</span>-model offers fitting flexibility, the self-consistent evaluation of coupled gap equations is strictly required to extract physically reliable gap magnitudes, spatial coherence scales, and coupling potentials (<span>(varLambda _{ij})</span>) from the bulk responses of multiband systems.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148237286","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}

{"title":"Study of Heat Transfer Processes in A Low-Temperature Magnetic Refrigeration System Containing GdNi(_2)","authors":"O. O. Pavlukhina,&nbsp;V. V. Sokolovskiy,&nbsp;V. D. Buchelnikov,&nbsp;M. V. Matyunina,&nbsp;I. S. Zotov","doi":"10.1007/s10948-026-07206-8","DOIUrl":"10.1007/s10948-026-07206-8","url":null,"abstract":"<div><p>The use of magnetocaloric materials in magnetic cooling systems is an important area of research today. In this study, three-dimensional magnetic cooling cells with thin GdNi<span>(_2)</span> plates and microwires of different thicknesses were investigated using the finite element method. The relaxation times for different coolant flow velocities were calculated. It was found that the relaxation time for microwires with a thickness of 10 and 40 <span>(mu )</span>m were 2.4 and 4.3 ms for a coolant speed of 0.7 m/s, for microwires with a thickness of 10 and 40 <span>(mu )</span>m were 1.5 and 3.4 ms for a coolant speed of 1.5 m/s, for microwires with a thickness of 10 and 40 <span>(mu )</span>m were 0.85 and 2.35 ms for a coolant speed of 3.0 m/s. Similarly, for plates with a thickness of 10 and 40 micrometers, the relaxation times were 3.4 and 5.4 ms for a coolant speed of 0.7 m/s, for microwires with a thickness of 10 and 40 <span>(mu )</span>m were 2.25 and 3.6 ms for a coolant speed of 1.5 m/s, for microwires with a thickness of 10 and 40 <span>(mu )</span>m were 1.7 and 3.2 ms for a coolant speed of 3.0 m/s. Microwires are more than 30 percent more efficient than plates at their small diameter. As the microwire diameter increases to 40 <span>(mu )</span>m, their efficiency becomes comparable to that of plates.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236513","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}

{"title":"Electronic, Magnetic, Optical, and Thermoelectric Properties of Yttrium-Based Quaternary Heusler Alloys: A First-Principles Study","authors":"M. Nandha Kumar,&nbsp;V. Aravindan,&nbsp;N. Laihnuna,&nbsp;M. Mahendran","doi":"10.1007/s10948-026-07192-x","DOIUrl":"10.1007/s10948-026-07192-x","url":null,"abstract":"<div><p>We computed various physical characteristics like elastic, structural, magnetic, electronic, optical, thermodynamic, and thermoelectric behaviour of Quaternary Heusler Alloys of YCoCrZ (Z = In, Sn, Sb) using FP-LAPW method. The method chosen exchange-correlation function is GGA-PBE. The material’s durability against mechanical and structural deformation indicates that these can be suitable for practical application. The indirect band gap values of 0.21 eV, 0.84 eV, and 0.71 eV for YCoCrIn, YCoCrSn, and YCoCrSb in the spin down state reveal that these compounds are half-metallic. The magnetic moments for YCoCrIn, YCoCrSn, and YCoCrSb are 3µ_B, 4µ_B, and 5µ_B, respectively, as determined by Slater-Pauling’s rule. This study looks at a lot of optical properties, including as refraction, reflection, the complex dielectric function, optical conductivity, absorption, and energy loss, for a wide range of photon energies. The calculated value of optical properties confirms this composition is suitable for optoelectronic applications. BoltzTrap2 was employed to investigate the thermoelectric performance at high temperature (1000 K). The calculated figures of merit (ZT) for YCoCrIn, YCoCrSn, and YCoCrSb are 1.56, 2.55, and 1.23, respectively.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 3","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148236566","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}