Journal of Superconductivity and Novel Magnetism最新文献_第4页

Manipulating the Magnetic Characteristics of Defective SrTiO3 (001) Surfaces Through O2 Adsorption: An Investigation via Hybrid Functional Calculations

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

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

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

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

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

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