Journal of Superconductivity and Novel Magnetism最新文献_第7页

Room-Temperature Ferromagnetism in ZnTe Nanosheet Doped by Transition Metal Atom 掺杂过渡金属原子的 ZnTe 纳米片的室温铁磁性

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-02-06 DOI: 10.1007/s10948-025-06920-z

Narmin A. Ismayilova

{"title":"Room-Temperature Ferromagnetism in ZnTe Nanosheet Doped by Transition Metal Atom","authors":"Narmin A. Ismayilova","doi":"10.1007/s10948-025-06920-z","DOIUrl":"10.1007/s10948-025-06920-z","url":null,"abstract":"<div>To investigate the potential functionalities of transition metal atom (V, Cr, Mn, Fe, Co, and Cu)-doped ZnTe nanosheets in nanoscale science and spintronic applications, we conducted spin-polarized density functional theory calculations. This study focused on doping at various concentrations of transition metal atoms, with the Zn edge which was the substitution position. The pristine ZnTe nanosheet is intrinsically nonmagnetic; however, the introduction of transition metal atoms induces spontaneous spin polarization, resulting in a significant magnetic moment. Electronic structure calculations reveal distinct conducting behaviors—semiconducting and half-metallic—depending on the concentration of the dopant atoms. Furthermore, the calculated Curie temperature, obtained through mean-field approximation, indicates values exceeding room temperature for all concentrations of V, Cr, Fe, and Cu, with an increasing trend as the concentration of transition metal atoms rises. These findings suggest that Cr-, Fe-, and Cu-doped ZnTe nanosheets may be good candidates for spintronic applications due to their ferromagnetism and high Curie temperatures.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361944","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

Manipulating the Magnetic Characteristics of Defective SrTiO3 (001) Surfaces Through O2 Adsorption: An Investigation via Hybrid Functional Calculations 通过氧吸附操纵缺陷SrTiO3（001）表面的磁特性：基于混合泛函数计算的研究

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-02-06 DOI: 10.1007/s10948-025-06926-7

Lihui Sun, Xinhui Lv, Yi Xu, Lin Xue, Yongjia Zhang

{"title":"Manipulating the Magnetic Characteristics of Defective SrTiO3 (001) Surfaces Through O2 Adsorption: An Investigation via Hybrid Functional Calculations","authors":"Lihui Sun, Xinhui Lv, Yi Xu, Lin Xue, Yongjia Zhang","doi":"10.1007/s10948-025-06926-7","DOIUrl":"10.1007/s10948-025-06926-7","url":null,"abstract":"<div>The electronic and magnetic properties of defective SrTiO3 (001) surfaces were examined through hybrid functional calculations, focusing on the impact of O2 adsorption. Among the various vacancy types considered—oxygen vacancy (VO), titanium vacancy (VTi), strontium vacancy (VSr), VTi + VO complex (VTi-O), and VSr + VO complex (VSr-O)—only VO, VTi, and VTi-O exhibit magnetic moments. At low O2 coverage, the adsorption of a single O2 molecule onto each defective surface results in a reduction of the magnetic moments for surfaces with VO, VTi, or VTi-O, potentially decreasing to zero. In contrast, the magnetic moment of surfaces with VSr-O increases from zero to 2 μB. Upon the addition of a second O2 molecule at high O2 coverage, the magnetic moments of surfaces with VO and VTi are significantly enhanced, attributed to the polarization of the p electrons of the two adsorbed O2 molecules. Surfaces with VTi-O or VSr-O complex defects do not adsorb additional O2 molecules, and surfaces with VSr are unable to adsorb O2 molecules. The variation in magnetic moments for the defective surfaces is correlated with the number of electrons acquired by the adsorbed O2 molecules.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143361945","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

Geometric Phase in Kitaev Quantum Spin Liquid 基塔耶夫量子自旋液体中的几何相位

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-02-05 DOI: 10.1007/s10948-025-06919-6

Zheng-Chuan Wang

引用次数: 0

Probing Magnetic Characteristics of (Co_{60}Fe_{40}) Films Prepared by Pulsed Laser Deposition 脉冲激光沉积(Co_{60}Fe_{40})薄膜的探测磁特性

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-02-05 DOI: 10.1007/s10948-025-06922-x

Khalil El Achi, Samih Isber, Malek Tabbal, Mohammad Haidar

引用次数: 0

Impact of Cr Insertion Layer on Spin Transport Properties in Co2FeAl/Ta System Cr插入层对Co2FeAl/Ta体系自旋输运特性的影响

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-02-01 DOI: 10.1007/s10948-025-06914-x

Rohiteswar Mondal, Vidya Alman, Arabinda Haldar, Chandrasekhar Murapaka

引用次数: 0

Current-Phase Relation for Transparent Superconducting Junctions 透明超导结的电流-相关系

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/s10948-025-06916-9

Artem V. Galaktionov, Andrei D. Zaikin

引用次数: 0

Memory Function of a Three-Dimensional Holstein-Like System 三维类荷尔斯坦系统的记忆函数

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

Hole-Polarons and Bipolarons in the Extended t − J − V Holstein Model 扩展t−J−V Holstein模型中的空穴极化子和双极化子

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 Mn2+取代的二维磁性半导体SnS2的光学和磁性：电子结构分析的粉末XRD方法

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 the Width of Microbridge on the Characteristics of YBCO Step-Edge Josephson Junction 微桥宽度对YBCO阶边约瑟夫森结特性的影响

IF 1.6 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2025-01-24 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