Journal of Superconductivity and Novel Magnetism最新文献

Effect of Short-Range Magnetic Order on Pseudogap Formation in Cuprates 近程磁序对铜酸盐赝隙形成的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-28 DOI: 10.1007/s10948-026-07239-z

S. G. Ovchinnikov, V.I. Kuz’min, T. M. Ovchinnikova

{"title":"Effect of Short-Range Magnetic Order on Pseudogap Formation in Cuprates","authors":"S. G. Ovchinnikov, V.I. Kuz’min, T. M. Ovchinnikova","doi":"10.1007/s10948-026-07239-z","DOIUrl":"10.1007/s10948-026-07239-z","url":null,"abstract":"<div>In this paper, based on the invited talk at the Samarkand conference SISM 2026, we discuss first the superconducting phase within the generalized mean field approach with pairing induced both by short-range antiferromagnetic coupling and electron-phonon interaction and secondly the origin of a pseudogap (PG) state in high-(T_c) cuprates. This phenomenon is beyond the standard Fermi liquid state. Already in the beginning of the HTSC era, phenomenological nearly antiferromagnetic Fermi liquid (NAFL) theory has been discussed in the literature to explain nuclear magnetic resonance (NMR) and inelastic neutron scattering data. Within this approach, the PG origin is related to short-range spin fluctuations. To understand how short-range spin correlations effect the electronic structure and magnetic susceptibility in a microscopic approach, we simultaneously studied the low-doping temperature evolution of both single particle spectra and spin correlations using cluster perturbation theory (CPT) and exact diagonalization. We have determined 3 temperature regimes in the normal phase: Fermi liquid, weak PG, and strong PG, and the d-wave superconducting phase formed by a combined action of magnetic and phonon coupling.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148838282","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

Crystal Structure and Magnetic Properties of the Quaternary Compound Al1.5Co2.5FeGd 季系化合物Al1.5Co2.5FeGd的晶体结构和磁性能

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-20 DOI: 10.1007/s10948-026-07238-0

Liuqing Liang, Weijun Li, Huiting Ouyang, Degui Li, Bing He

{"title":"Crystal Structure and Magnetic Properties of the Quaternary Compound Al1.5Co2.5FeGd","authors":"Liuqing Liang, Weijun Li, Huiting Ouyang, Degui Li, Bing He","doi":"10.1007/s10948-026-07238-0","DOIUrl":"10.1007/s10948-026-07238-0","url":null,"abstract":"<div>The quaternary compound Al1.5Co2.5FeGd was melted and synthesized using a vacuum arc furnace. Powder X-ray diffraction and Rietveld refinement were employed to determine its crystallographic parameters. The results reveal that Al1.5Co2.5FeGd retains a CaCu5-type structure (space group P6/mmm, No. 191). The lattice constants are refined to a = 5.1042(3) Å and c = 4.0560(2) Å. The residual factors Rp and Rwp were converged to 8.41% and 10.07%, respectively. Furthermore, magnetic measurements were performed on Al1.5Co2.5FeGd under a low applied field of 50 Oe, showing that its Curie temperature Tc is 395.2 K. High-field magnetic characterization further demonstrates that the saturation magnetization Ms, remanence Mr, and coercivity Hc decrease with increasing temperature over the measured temperature range, and weak ferrimagnetic behavior is observed at room temperature. Meanwhile, the hysteresis losses Wh at 2 K and 300 K are 184.58 kJ·m−³ and 91.54 kJ·m−³, respectively.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 5","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148782714","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

Enhanced Superconducting Performance of MgB₂ Wires via Cold High-Pressure Densification and Drawing Process 冷高压致密拉拔工艺提高MgB 2导线超导性能

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-13 DOI: 10.1007/s10948-026-07234-4

Mohammed Shahabuddin, Nasser S. Alzayed, Niyaz A. Madhar, Shahid M. Ramay, Bilal Taha

{"title":"Enhanced Superconducting Performance of MgB₂ Wires via Cold High-Pressure Densification and Drawing Process","authors":"Mohammed Shahabuddin, Nasser S. Alzayed, Niyaz A. Madhar, Shahid M. Ramay, Bilal Taha","doi":"10.1007/s10948-026-07234-4","DOIUrl":"10.1007/s10948-026-07234-4","url":null,"abstract":"<div>MgB₂ wires fabricated by the advanced magnesium infiltration process (AMIP) were subjected to different drawing steps and cold high-pressure densification (CHPD) at 0.8 GPa. Four samples were compared: as-drawn A1 and further-drawn A2, together with their CHPD-pressed counterparts, AP1 and AP2. X-ray diffraction confirmed the phase purity of MgB₂, with lattice parameters of (a = 3.0882) Å and (c = 3.5261) Å. SEM analysis revealed a substantial reduction in porosity and improved grain compaction following CHPD. The wire-core area decreased by 19% from A1 to AP1 and by 6.5% from A2 to AP2, confirming effective densification. Magnetization measurements showed nearly identical superconducting transition temperatures (Tc approx 36.6 K) for all samples, indicating that CHPD modified the microstructure without affecting the phase composition. Drawing alone enhanced the low-field critical current density (Jc) by improving grain connectivity. At 0 T and 20 K, A2 exhibited a Jc of 2.51 × 105 A/cm², representing a 19% improvement over A1. Combining drawing with CHPD produced a further enhancement, with AP2 reaching 2.7 × 105 A/cm² at 0 T and 20 K, corresponding to an overall improvement of 28%. At 3T, Jc increased from (1.52 × 104) to (1.83 × 104) A/cm², representing a 20% improvement in field performance compared with the unpressed wires. The irreversibility field (Hirr) remained nearly unchanged at approximately 5.8 T, confirming that the observed performance gains originated primarily from improved grain connectivity and reduced porosity. The optimized combination of drawing and CHPD therefore provides a practical route toward industrial-grade MgB₂ wires for high-field applications operating near 20 K.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751702","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

Piper Nigrum Assisted Green Synthesis of Cr3+ Doped Nickel-Zinc Spinel Ferrite Nanoparticles for Photocatalytic Activity Piper Nigrum辅助绿色合成Cr3+掺杂镍锌尖晶石铁氧体纳米粒子的光催化活性

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-13 DOI: 10.1007/s10948-026-07230-8

Shital P. Nawale, Kalyani K. Deshmukh, Punam B. Dube, Pratik S. Patil, A. P. Keche, K. M. Jadhav

{"title":"Piper Nigrum Assisted Green Synthesis of Cr3+ Doped Nickel-Zinc Spinel Ferrite Nanoparticles for Photocatalytic Activity","authors":"Shital P. Nawale, Kalyani K. Deshmukh, Punam B. Dube, Pratik S. Patil, A. P. Keche, K. M. Jadhav","doi":"10.1007/s10948-026-07230-8","DOIUrl":"10.1007/s10948-026-07230-8","url":null,"abstract":"<div>In the current work, Cr-substituted nickel-zinc spinel ferrite magnetic nanoparticles (NPs) with the configuration Ni0.7Zn0.3CrxFe2−xO4 (x = 0.0–0.4) were developed using the extract of Piper nigrum (black pepper) as both a chelating agent and an eco-friendly fuel. X-ray diffraction (XRD) and Rietveld analysis verified that the constructed material exhibits single-phase formation with a cubic spinel structure. Lattice parameter decreases with Cr substitution, from 8.372 Å to 8.356 Å. The formation of the spinel phase was further confirmed by Fourier transform infrared (FTIR) spectroscopy, which revealed two distinct absorption bands within the 400–600 cm− 1 region. Raman spectroscopic investigation identified five distinct vibrational modes. Scanning electron microscopy (SEM) analysis of typical samples showed a compact microstructure composed of uniformly distributed spherical grains. Elemental analysis using (EDAX) spectra revealed the existence of all the desired elements. BET analysis showed an enhanced surface area for typical samples with x = 0.1 and 0.3. The VSM technique was employed to demonstrate the reduction in magnetic properties at room temperature after Cr3+ doping. The band gap energy determined from UV-vis spectroscopy decreases from 1.75 eV to 1.59 eV after doping with Cr3+ ions. Photocatalytic activity was evaluated using methylene blue (MB) under sunlight. The higher photocatalytic degradation activity of the sample with concentration x = 0.3 was 86.10% compared with the other samples.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751703","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

Superparamagnetic Behaviour and Magnetotransport in Mn-doped Ni/NiO Nanocomposites mn掺杂Ni/NiO纳米复合材料的超顺磁性和磁输运

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-12 DOI: 10.1007/s10948-026-07232-6

S. D. Kamble, C. D. Kamble, U. P. Gawai, N. B. Thakare, P. G. Chavan, D. Kumar, S. K. Gurav

{"title":"Superparamagnetic Behaviour and Magnetotransport in Mn-doped Ni/NiO Nanocomposites","authors":"S. D. Kamble, C. D. Kamble, U. P. Gawai, N. B. Thakare, P. G. Chavan, D. Kumar, S. K. Gurav","doi":"10.1007/s10948-026-07232-6","DOIUrl":"10.1007/s10948-026-07232-6","url":null,"abstract":"<div>In the present work, pure and Mn (0.00, 0.02) doped Ni/NiO nanocomposites were synthesized via a microwave-assisted sol-gel auto-combustion method. The synthesized samples were characterized using X-ray diffraction (XRD), Raman spectroscopy, atomic force microscopy (AFM), vibrating sample magnetometer (VSM), and magnetoresistance (MR) measurements. Raman analysis revealed the presence of 1LO mode for pure Ni/NiO and 2LO mode for Mn-doped Ni/NiO. AFM images confirmed uniform and densely packed grains with root-mean-square (RMS) roughness values ranging from 23 to 32 nm. The 2% Mn-doped Ni/NiO nanostructures exhibit enhanced ferromagnetism with a blocking temperature around 200 K, as revealed by ZFC-FC bifurcation. Magnetic hysteresis loops confirm zero coercivity and no remanence, indicating soft ferromagnetic behaviour with superparamagnetic-like relaxation. The MR of 2% Mn-doped Ni/NiO nanocomposites was investigated over a wide temperature range (2–300 K). All samples exhibited negative MR due to suppression of AFM domains and enhanced FM ordering, with a maximum value of -0.40% at 300 K, while pure Ni/NiO showed a higher MR of -0.6%. The observed negative magnetoresistance and butterfly-like hysteresis are directly correlated with the coexistence of ferromagnetic Ni and antiferromagnetic NiO phases, where spin-dependent scattering and domain wall dynamics govern the transport behavior. Fitting of the resistivity to a Bloch-Grüneisen and Fermi liquid (T2) model yields a nearly field-independent Debye temperature ((:{{Theta:}}_{D})≈303–320 K). Doping significantly enhances the residual resistivity and electron-phonon scattering coefficient, consistent with stronger disorder scattering.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751489","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

Half-metallic Ferromagnetism and Giant Magnetic Anisotropy in Vacancy-ordered Double Perovskite Rb2WBr6 空位有序双钙钛矿Rb2WBr6的半金属铁磁性和巨磁各向异性

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-12 DOI: 10.1007/s10948-026-07231-7

Haiming Huang, Yiyuan Xiao, Ziyu Liu, Cheng Liu, Xuejing Yang, Yonghong Hu, Amel Laref

{"title":"Half-metallic Ferromagnetism and Giant Magnetic Anisotropy in Vacancy-ordered Double Perovskite Rb2WBr6","authors":"Haiming Huang, Yiyuan Xiao, Ziyu Liu, Cheng Liu, Xuejing Yang, Yonghong Hu, Amel Laref","doi":"10.1007/s10948-026-07231-7","DOIUrl":"10.1007/s10948-026-07231-7","url":null,"abstract":"<div>We report a first-principles investigation on cubic double perovskite Rb2WBr6, which exhibits an exceptional combination of structural robustness, mechanical flexibility, perfect spin polarization, high Curie temperature, and giant magnetic anisotropy-key merits urgently demanded in advanced spintronics. This compound possesses excellent thermodynamic stability confirmed by tolerance factor, negative formation energy, and cohesive energy. Mechanical evaluations demonstrate its satisfied Born-Huang stability, superior ductility, and intrinsic flexibility, enabling facile integration into flexible devices. Remarkably, Rb2WBr6 is identified as a robust half-metal with 100% spin polarization at the Fermi level, accompanied by a large half-metallic gap of 0.85 eV for high operational stability. The total magnetic moment is 2.0 μB per unit cell, dominated by W atoms. Most prominently, it achieves a record-high three-dimensional magnetic anisotropy energy up to 2881.41 μeV/unit cell, far beyond most rare-earth-free magnets. These superior integrated properties make Rb2WBr6 a highly promising candidate for next-generation spintronic devices, flexible magnetoelectronics, and high-density magnetic storage systems.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751481","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 First-Principles Study of Structural, Electronic, Magnetic, Mechanical and Thermodynamic Properties of CeCrO3 Compound CeCrO3化合物结构、电子、磁性、力学和热力学性质的第一性原理研究

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-11 DOI: 10.1007/s10948-026-07226-4

Omer Kabi, Alae Samih, Hussein Sabbah, Rachid El Fdil, Zakaria Fadil, Mohammed S.S. Abu-Jafar, Mahmoud M.A. Farout, El Mehdi Salmani, Ahmad A.A. Mousa, Hala S. A Ghannam, Chaitany Jayprakash Raorane, Salah Saadaoui

{"title":"A First-Principles Study of Structural, Electronic, Magnetic, Mechanical and Thermodynamic Properties of CeCrO3 Compound","authors":"Omer Kabi, Alae Samih, Hussein Sabbah, Rachid El Fdil, Zakaria Fadil, Mohammed S.S. Abu-Jafar, Mahmoud M.A. Farout, El Mehdi Salmani, Ahmad A.A. Mousa, Hala S. A Ghannam, Chaitany Jayprakash Raorane, Salah Saadaoui","doi":"10.1007/s10948-026-07226-4","DOIUrl":"10.1007/s10948-026-07226-4","url":null,"abstract":"<div>A first-principles study of orthorhombic CeCrO3 is carried out to investigate its structural, electronic, magnetic, elastic, and thermodynamic properties. The results confirm the stability of the orthorhombic perovskite structure. Electronic calculations indicate half-metallicity within the GGA and SCAN approximations with a magnetic moment of ~ 8 µB. A systematic GGA + U investigation reveals a transition to a semiconducting state with increasing electron correlation, yielding a band gap of 3.02 eV, in excellent agreement with the experimental optical gap of 3.04 eV. The material exhibits a robust ferromagnetic ground state dominated by Cr moments, with contributions from Ce and O through orbital hybridization. Elastic analysis reveals a stiff, moderately ductile with a poisson’s ratio of 0.266, and anisotropic material, while thermodynamic properties confirm strong bonding and thermal stability. These findings highlight CeCrO3 as a promising candidate for spintronic, magnetoelectric, and multifunctional applications.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751099","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

Thermal Quantum Correlations in a Two-Qubit XXZ Heisenberg Chain with Dzyaloshinskii–Moriya, Kaplan–Shekhtman–Entin–Wohlman–Aharony, and Asymmetric In-Plane Anisotropy Interactions 具有Dzyaloshinskii-Moriya， Kaplan-Shekhtman-Entin-Wohlman-Aharony和不对称面内各向异性相互作用的二量子位XXZ海森堡链中的热量子相关

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-10 DOI: 10.1007/s10948-026-07233-5

Mounaim Hamdoune, Mohammed Daoud

{"title":"Thermal Quantum Correlations in a Two-Qubit XXZ Heisenberg Chain with Dzyaloshinskii–Moriya, Kaplan–Shekhtman–Entin–Wohlman–Aharony, and Asymmetric In-Plane Anisotropy Interactions","authors":"Mounaim Hamdoune, Mohammed Daoud","doi":"10.1007/s10948-026-07233-5","DOIUrl":"10.1007/s10948-026-07233-5","url":null,"abstract":"<div>This work investigates quantum correlations in a thermally equilibrated two-qubit Heisenberg XXZ spin chain extended with Dzyaloshinskii–Moriya (DM), Kaplan–Shekhtman–Entin–Wohlman–Aharony (KSEA) interactions, and a physically motivated asymmetric exchange anisotropy ((delta )) that breaks the symmetry within the xy-plane. We derive the exact thermal density matrix and analytically evaluate two measures of non-classicality: Local Quantum Uncertainty (LQU) and Trace Distance Discord (TDD). We complement this with an analysis of concurrence as a standard entanglement measure to provide a comprehensive comparative perspective. Our results show that the DM interaction significantly enhances and thermally stabilizes both LQU and TDD. In contrast, the asymmetric anisotropy (delta ) plays a contrary role: it consistently suppresses these quantum correlations, a behavior not reported in previous generalized models. The KSEA interaction introduces a distinct effect that slows the thermal decay of TDD. We provide a spectral explanation for this behavior by examining the energy gap structure of the Hamiltonian. The results demonstrate how the competition between different types of spin–orbit couplings—antisymmetric DM, symmetric KSEA, and the new in-plane anisotropy (delta )—can be used to control the robustness of quantum correlations against temperature fluctuations. We also discuss how these coupling constants can be linked to experimentally accessible regimes in strained quantum dots or cold-atom lattices.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751213","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

Phase Transitions and Critical Behavior in the Two-Dimensional Weakly Diluted 4-State Potts Model 二维弱稀释四态波模型的相变和临界行为

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-10 DOI: 10.1007/s10948-026-07235-3

A. K. Murtazaev, A. B. Babaev, M. A. Babaev

{"title":"Phase Transitions and Critical Behavior in the Two-Dimensional Weakly Diluted 4-State Potts Model","authors":"A. K. Murtazaev, A. B. Babaev, M. A. Babaev","doi":"10.1007/s10948-026-07235-3","DOIUrl":"10.1007/s10948-026-07235-3","url":null,"abstract":"<div>Here, we introduce a high-precision Monte Carlo study examining the static critical behavior of the 4-state Potts model subjected to quenched disorder on a hexagonal lattice. The calculations are conducted for spin systems under periodic boundary conditions at spin concentrations of p = 1.0–0.80. Systems with linear sizes L in the range L = 21–180 are studied. The fourth-order Binder cumulant method is employed for determining the critical temperatures. The critical exponents β, γ, α, and v, describing magnetization, susceptibility, heat capacity, and correlation radius respectively, were determined using finite-size scaling theory for the dilution range p studied. Our findings affirm a second-order phase transition, exhibiting critical exponents consistent with the undiluted pure (p = 1.00) 2D 4-state Potts model’s universality class. For weak non-magnetic dilution (p = 0.90, 0.80), the addressed model exhibits a new set of critical exponents, defining a universality class different from the pure Potts model.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751212","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 Electric Field and Biaxial Strain on the Structural, Electronic, Magnetic, Phonon, and Optical Properties of Bulk and Monolayer VBi 电场和双轴应变对块体和单层VBi结构、电子、磁性、声子和光学性质的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2026-08-08 DOI: 10.1007/s10948-026-07229-1

Muhammad Rashid Iqbal, Iqra Asif

{"title":"Influence of Electric Field and Biaxial Strain on the Structural, Electronic, Magnetic, Phonon, and Optical Properties of Bulk and Monolayer VBi","authors":"Muhammad Rashid Iqbal, Iqra Asif","doi":"10.1007/s10948-026-07229-1","DOIUrl":"10.1007/s10948-026-07229-1","url":null,"abstract":"<div>This study using the first-principles density functional theory (DFT) calculation within the CASTEP package, we systematically investigate the structural, electronic, magnetic and optical properties of bulk, monolayer VBi and effects of external electric field and the biaxial strain to the monolayer.The bulk phase crystallizes with a lattice constant of (varvec{6.32}) Å and an indirect band gap of 0.65 eV (PBE-GGA) and 1.2 eV (HSE06), which is indicative of half-metallic behaviour.The band gap of GGA is 0.59 eV, and it is 0.98 eV for HSE06 in the spin-down channel, For the monolayer, the lattice constant is (varvec{8.2}) Å and the total magnetic moment is (varvec{2mu }) B, which is in accord with the Slater-Pauling rule (Zt = 8). The half-metallic character is maintained in the presence of biaxial strain (-6% to +6%) and perpendicular electric fields (up to ±0.8 V/nm), over a critical range of which a transition to semiconducting occurs. The optical dielectric function, refractive index and absorption coefficient are highly strain and field tunable. With its strong half-metallicity and external field tunability, our results suggest that monolayer VBi can be a good candidate for spintronics and optoelectronic applications.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 4","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148751315","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