Journal of Superconductivity and Novel Magnetism最新文献_第9页

Thermopower and Hall Effect in Correlated Metals and Doped Mott-Hubbard Insulators: DMFT Approximation 相关金属和掺杂Mott-Hubbard绝缘体的热功率和霍尔效应：DMFT近似

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-16 DOI: 10.1007/s10948-025-07108-1

E. Z. Kuchinskii, N. A. Kuleeva

{"title":"Thermopower and Hall Effect in Correlated Metals and Doped Mott-Hubbard Insulators: DMFT Approximation","authors":"E. Z. Kuchinskii, N. A. Kuleeva","doi":"10.1007/s10948-025-07108-1","DOIUrl":"10.1007/s10948-025-07108-1","url":null,"abstract":"<div><p>We present brief review of theoretical studies of thermopower and Hall effect in the Hubbard model within the DMFT approximation for correlated metal and Mott insulator (considered as prototype cuprate superconductor) for different concentrations of current carriers. Analysis is performed within standard DMFT approximation. For Mott insulator we consider the typical case of partial filling of the lower Hubbard band (hole doping). We calculate the dependence of the Hall coefficient and thermopower on doping level and determine the critical concentration of carriers corresponding to sign change of these quantities. A significant temperature dependence of the Hall coefficient and an anomalous dependence of thermopower on temperature (significantly different from linear typical for the usual metals) is obtained. The role of disorder scattering is analyzed on qualitative level. We also perform a comparison of our theoretical results with some known experiments on doping dependence of Hall number in the normal state of YBCO and Nd-LSCO, demonstrating rather satisfactory agreement of theory and experiment. Violation of electron-hole symmetry leads to the appearance of the relatively large interval of band-fillings (close to the half-filling) where thermopower and Hall effects have different signs. We propose a certain scheme allowing to determine the number of carriers from ARPES data and perform semi-quantitative estimate of both thermopower and Hall coefficient using the usual DFT calculations of electronic spectrum.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145778653","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

The Magnetocaloric Effect in Mesoscopic Type-I Superconducting Needles 介观i型超导针中的磁热效应

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-16 DOI: 10.1007/s10948-025-07104-5

David B. Zevallos G., A. Bustamante Dominguez, D. André Orna T., Luis De Los Santos Valladares, Mauro M. Dória, Isaías G. de Oliveira

引用次数: 0

Zeeman Field Effect on Zero-energy Vortex and Corner Modes in a Two Dimensional Second-order Topological Superconductor 二维二阶拓扑超导体零能涡旋和角模的塞曼场效应

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-15 DOI: 10.1007/s10948-025-07110-7

A. O. Zlotnikov, A. D. Fedoseev, S. V. Aksenov

引用次数: 0

Understanding the Asymmetry of the Critical Current Angular Dependence of Coated Conductors 了解涂层导体临界电流角依赖的不对称性

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-11 DOI: 10.1007/s10948-025-07103-6

V. V. Guryev, S. V. Shavkin, O. A. Kondratev

引用次数: 0

Hall Coefficient and Specific Heat of Two-Liquid System of Charge Carriers Formed at Strong Electron-Phonon Coupling and Cuprates-Like Dispersion 在强电子-声子耦合和类铜酸盐色散下形成的载流子双液系统的霍尔系数和比热

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-10 DOI: 10.1007/s10948-025-07094-4

A. E. Myasnikova, S. V. Doronkina, A. H. Dzhantemirov, R. R. Arutyunyan, A. S. Fukalov

{"title":"Hall Coefficient and Specific Heat of Two-Liquid System of Charge Carriers Formed at Strong Electron-Phonon Coupling and Cuprates-Like Dispersion","authors":"A. E. Myasnikova, S. V. Doronkina, A. H. Dzhantemirov, R. R. Arutyunyan, A. S. Fukalov","doi":"10.1007/s10948-025-07094-4","DOIUrl":"10.1007/s10948-025-07094-4","url":null,"abstract":"<div><p>Almost all the properties of cuprate high-temperature superconductors are no less mysterious than their superconductivity. From the very beginning of their study, it was noted that a two-component system of charge carriers is suitable for their description, which, however, had to be introduced phenomenologically. Recently it has been shown that ground and low-excited states of a system with strong long-range electron-phonon interaction and cuprates-like dispersion at carrier densities characteristic of cuprate superconductors are a two-liquid system of charge carriers comprising Bose-liquid of large bipolarons and Fermi-liquid of delocalized carriers. The phase diagram of such a system was demonstrated to coincide with that observed in cuprates. The temperature of the superconducting transition in them was shown to increase with the number of conducting layers in the unit cell, like in cuprates, due to the change in the spectrum of elementary excitations of the bipolaron liquid. Here we calculate temperature and doping behavior of the electronic specific heat and Hall resistance of such systems and compare it with that observed in cuprates. The low-temperature electronic specific heat obtained demonstrates giant increase at increasing doping, like that observed in cuprates at the overdoping. The increase is related with gradual decay of bipolarons at increasing temperature or doping. We also show that this decay may be responsible for the decrease in Hall resistance with increasing temperature observed in cuprates.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 1","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145729690","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

Planar Josephson Junctions for Sensors and Electronics 传感器和电子器件的平面约瑟夫森结

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-08 DOI: 10.1007/s10948-025-07096-2

Vladimir M. Krasnov

引用次数: 0

A Tribute to John Clarke, Michel Devoret and John Martinis for their Experiments on Quantum Tunneling and Energy Level Quantization in a Superconducting Macroscopic Circuit, Nobel Prize for Physics in 2025 2025年诺贝尔物理学奖授予John Clarke， Michel Devoret和John Martinis，表彰他们在超导宏观电路中的量子隧穿和能级量子化实验

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-05 DOI: 10.1007/s10948-025-07101-8

Brian Josephson, Anthony Leggett, Jason Robinson, Francesco Tafuri

引用次数: 0

Unravelling Defect Mediated Magnetism in Anatase TiO₂ Nanoparticles through Structural, Optical, and Magnetic Characterizations 通过结构、光学和磁性表征揭示锐钛矿tio2纳米颗粒中缺陷介导的磁性

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-04 DOI: 10.1007/s10948-025-07100-9

Bhargav Bhagvat, Rama Shanker Gupta, Parth Patel, Santosh Kumar Sahoo, Ariful Rahaman, Akhilananda Kumar, Asokan Kandasami, Vijay Raj Singh

{"title":"Unravelling Defect Mediated Magnetism in Anatase TiO₂ Nanoparticles through Structural, Optical, and Magnetic Characterizations","authors":"Bhargav Bhagvat, Rama Shanker Gupta, Parth Patel, Santosh Kumar Sahoo, Ariful Rahaman, Akhilananda Kumar, Asokan Kandasami, Vijay Raj Singh","doi":"10.1007/s10948-025-07100-9","DOIUrl":"10.1007/s10948-025-07100-9","url":null,"abstract":"<div><p>The structural, optical, and magnetic properties of TiO₂ nanoparticles were systematically investigated to explore the origin of room-temperature weak ferromagnetism (RTFM). Structural analysis confirmed the presence of a tetragonal anatase phase with high crystallinity, exhibiting characteristic vibrational modes of pure TiO₂ and surface functional groups associated with Ti–O bonding. Optical studies revealed a indirect bandgap of ~ 3.24 eV, slightly higher than the reported 3.20–3.22 eV for pure anatase, along with defect-related electronic transitions. The morphology indicates uniformly distributed nanocrystallites, and the magnetic measurements demonstrate a weak ferromagnetism at room temperature, which most likely arises from intrinsic defects such as oxygen vacancies. Compared with literature, where anatase TiO₂ is typically diamagnetic and or shows the RTFM only after defect engineering, the observation of weak ferromagnetism in undoped samples highlights the intrinsic role of defects in magnetic ordering. These insights are likely to advance the understanding of defect-driven magnetism and suggest promising applications of anatase TiO₂ nanoparticles in optoelectronics and spintronics. </p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145675278","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

Dynamic Hysteresis in Molecular-Based Magnetic Systems (I): Application of the Path Probability Method to the Mixed-Spin (1, 7/2) Blume-Capel Ising Model 基于分子的磁系统的动态滞后(I)：路径概率方法在混合自旋（1,7 /2）blme - capel Ising模型中的应用

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-03 DOI: 10.1007/s10948-025-07080-w

Mustafa Gençaslan, Mariya Fadhil Imran Alhameri, Ahmet Dervişoğlu

{"title":"Dynamic Hysteresis in Molecular-Based Magnetic Systems (I): Application of the Path Probability Method to the Mixed-Spin (1, 7/2) Blume-Capel Ising Model","authors":"Mustafa Gençaslan, Mariya Fadhil Imran Alhameri, Ahmet Dervişoğlu","doi":"10.1007/s10948-025-07080-w","DOIUrl":"10.1007/s10948-025-07080-w","url":null,"abstract":"<div><p>This study systematically investigates the non-equilibrium magnetic loop responses (DMHBs) of a mixed-spin (1, 7/2) Blume-Capel Ising system (BCIS) on a hexagonal lattice under an sinusoidal magnetic stimuli using the PPM framework (PPM). We explore the effects of the system parameters: exchange interaction parameters (<span>({J}_{sigma S})</span> and <span>({J}_{SS})</span>), temperature (<i>T</i>), oscillating magnetic field frequency (ω), crystal field parameter (<i>d</i>), and kinetic rate constants (<span>({k}_{2})</span>). Our findings reveal complex and varied hysteresis loop morphologies, including triple, double, and elliptical loops, for both individual sublattices (<span>({m}^{A})</span> ,<span>({m}^{B})</span>) and total magnetization (<span>({m}^{T})</span>). We analyzed the corresponding coercive fields (CFs) and remanent magnetizations (RMs). The results demonstrate how changes in these parameters significantly influence the DMHBs, leading to characteristics indicative of both hard and soft magnetic materials. Notably, the kinetic rate constant <span>({k}_{2})</span> is found to play a crucial role, analogous to wheel speed in rapid solidification processes, affecting the loop area and thus the “hardness” of the simulated magnet. While our theoretical predictions generally align with existing theoretical literature, some interesting discrepancies with experimental observations are noted. These differences may arise from practical limitations in experimental setups, such as the achievable wheel speed in melt spinning, or variations in the compositional concentrations of magnetic alloys. This research provides valuable insights into the non-equilibrium dynamics of molecular-based spin-configured molecular systems and extends the application of the PPM to complex mixed-spin systems.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 6","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145675041","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

Ferromagnetic Diatomic Molecules Consisting of Spin-1/2 and Spin-3/2 由自旋1/2和自旋3/2组成的铁磁双原子分子

IF 1.7 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-12-01 DOI: 10.1007/s10948-025-07098-0

Erhan Albayrak

引用次数: 0