Journal of Superconductivity and Novel Magnetism最新文献_第10页

Realizing Antiferromagnetic-Ferromagnetic Transition and Giant Enhancement of Magnetism in Co(Ga2-xFex)O4 Spinel Ferrites Co(Ga2-xFex)O4尖晶石铁氧体中反铁磁-铁磁转变及磁性大幅增强的实现

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-04 DOI: 10.1007/s10948-023-06522-7

Chaocheng Liu, Jiyu Hu, Haifeng Xu

{"title":"Realizing Antiferromagnetic-Ferromagnetic Transition and Giant Enhancement of Magnetism in Co(Ga2-xFex)O4 Spinel Ferrites","authors":"Chaocheng Liu, Jiyu Hu, Haifeng Xu","doi":"10.1007/s10948-023-06522-7","DOIUrl":"10.1007/s10948-023-06522-7","url":null,"abstract":"<div>The modulation of ions substitution has been regarded as a promising route to induce magnetic transition and tailor intrinsic properties for spinel ferrites as expected. Herein, Fe-substituted Co(Ga2-xFex)O4 spinel ferrites have been successfully prepared by a solid-state method. It is shown that the lattice constant increases gradually with the rising amount of Fe substitution due to a larger ionic radius of Fe than that of Ga. More importantly, a significant improvement in magnetic properties has been achieved under the effort of Fe substitution, especially in intrinsic coercivity (Hc). Correspondingly, the saturation magnetization (Ms), Hc, and Curie temperature (TC) increase from 11.01 emu/g, 0.29 kOe, and 10 K to 86.05 emu/g, 11.45 kOe, and 318 K respectively based on Fe substitution. Our work realizes a marked modulation of magnetic properties in Co(Ga2-xFex)O4, providing a fundamental strategy for magnetism tuning as well as the development of magnetic devices.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"965 - 974"},"PeriodicalIF":1.8,"publicationDate":"2023-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4177177","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 and Thermal-Driven Transport Across T-Shaped Double Quantum Dot Josephson Junction t形双量子点Josephson结的相位和热驱动输运

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-03 DOI: 10.1007/s10948-023-06526-3

Bhupendra Kumar, Sachin Verma, Ajay

{"title":"Phase and Thermal-Driven Transport Across T-Shaped Double Quantum Dot Josephson Junction","authors":"Bhupendra Kumar, Sachin Verma,  Ajay","doi":"10.1007/s10948-023-06526-3","DOIUrl":"10.1007/s10948-023-06526-3","url":null,"abstract":"<div>The phase- and thermal-driven transport properties of the T-shaped uncorrelated double quantum dot Josephson junction are analyzed by using Keldysh non-equilibrium Green’s function equation of motion technique. In this setup, we have shown that the side-attached quantum dot provides an additional route for electron transmission which is affecting the transport properties by adjusting the interdot hopping between the main dot and the side dot. We began with investigating the impact of interdot hopping on Andreev bound states and Josephson supercurrent. When a small thermal bias is applied across the superconducting leads, the system exhibits a finite thermal response which is primarily due to the thermally induced, quasi-particle current. The behavior of the Josephson supercurrent and the quasi-particle current flowing through the quantum dots is examined for various interdot hopping and thermal biasing. Finally, the system is considered in an open-circuit configuration where the thermally driven quasi-particle current is compensated by the phase-driven Josephson supercurrent and the thermophase effect is observed. The effect of interdot hopping and the position of quantum dot energy level on the thermophase Seebeck coefficient is investigated.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"831 - 841"},"PeriodicalIF":1.8,"publicationDate":"2023-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-023-06526-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4133700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Quantum Entanglement in Heisenberg Model with Dzyaloshinskii-Moriya Interactions 具有Dzyaloshinskii-Moriya相互作用的海森堡模型中的量子纠缠

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-02 DOI: 10.1007/s10948-023-06523-6

Qinghui Li, Chuanzheng Miao, Yuliang Xu, Xiangmu Kong

{"title":"Quantum Entanglement in Heisenberg Model with Dzyaloshinskii-Moriya Interactions","authors":"Qinghui Li, Chuanzheng Miao, Yuliang Xu, Xiangmu Kong","doi":"10.1007/s10948-023-06523-6","DOIUrl":"10.1007/s10948-023-06523-6","url":null,"abstract":"<div>Using the two-site cluster mean-field method and the concept of negativity, the magnetization and entanglement of spin-1 quantum ferromagnetic Heisenberg model with Dzyaloshinskii-Moriya (DM) interactions on d-dimensional ((d=1,2,3,4)) lattices are studied. The phase transitions and the variations of the negativity with temperature, anisotropy and DM interaction parameters are obtained. It is found that in the systems there are both second-order, first-order phase transitions and tricritical points. For the one-dimensional system, there is a maximum value of the negativity at a certain temperature which corresponds to the phase transition point for the case of first-order phase transition, and the maximum value increases with the increase of the DM interaction intensity. We also find that for two-dimensional square lattice with different temperature values, negativity increases with increasing DM interaction, and finally approaches to the same value. There is a lower limit of the DM interaction intensity (or temperature) above which negativity exists. In addition, we discuss the effect of the dimension on the magnetization, negativity and tricritical point. The results show that the tricritical temperature is independent of the exchange anisotropy parameter (Delta), and the lower the dimension, the more obvious the quantum effect.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"957 - 964"},"PeriodicalIF":1.8,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-023-06523-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4095705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the Magnetic Influence on Magneto-optical Interactions 分析磁对磁光相互作用的影响

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-02 DOI: 10.1007/s10948-023-06530-7

Wibson W. G. Silva, Luana M. C. S. Hildever, Maria C. G. Santos, Francisco Estrada, José Holanda

引用次数: 2

Magnetocaloric Effect in R6Fe23: R = Dy, Ho, Er, and Tm R6Fe23的磁热效应:R = Dy, Ho, Er，和Tm

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-01 DOI: 10.1007/s10948-023-06529-0

Raghda Abu Elnasr, Samy H. Aly, Sherif Yehia, Fatema Z. Mohammad

{"title":"Magnetocaloric Effect in R6Fe23: R = Dy, Ho, Er, and Tm","authors":"Raghda Abu Elnasr, Samy H. Aly, Sherif Yehia, Fatema Z. Mohammad","doi":"10.1007/s10948-023-06529-0","DOIUrl":"10.1007/s10948-023-06529-0","url":null,"abstract":"<div>We present a mean field study on the R6Fe23 system, where R = Dy, Ho, Er, and Tm, to calculate the magnetization, magnetic heat capacity, and the magnetocaloric effect (MCE) (isothermal entropy change (ΔSm) and the adiabatic temperature change (ΔTad)) for different field changes up to 5 T and at temperatures ranging from 0 to 600 K. The maximum ΔSm, using the trapezoidal method, for the R6Fe23 system is in the range 4.9–9.8 J/K mol, and the maximum ΔTad is in the range 9.56–15.17 K for a field change ΔH = 5 T. The largest ΔSm and largest ΔTad are found for Tm6Fe23 to be 9.8 J/K mol and 15.17 K at Curie temperature Tc = 489 K, for ΔH = 5 T. The relative cooling power RCP(S) is in the range 148–560 J/mol for ΔH = 5 T, which is comparable to that of bench-mark materials, e.g., Gd. Also, the RCP based on the adiabatic temperature change, RCP(T) is in the range 449–1092 K2 for ΔH = 5 T, which is comparable also to that of bench-mark materials, e.g., Gd. We investigated the type of phase transition in the light of universal curves, Arrott plots, and the behavior of the magnetic moment, magnetic heat capacity, and MCE (ΔSm, ΔTad), which confirm that the type of phase transition at Tc of this system is second-order phase transition (SOPT). A calculation of some critical exponents adds more evidence that the MFT is fairly suitable to handle the aforementioned properties in the studied systems.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"931 - 938"},"PeriodicalIF":1.8,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-023-06529-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4043482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetic Materials of La2/3-xEuxCa1/3MnO3 Manganites for the Refrigeration Application from 150 to 225 K 150 ~ 225k制冷用La2/3-xEuxCa1/3MnO3锰铁磁性材料

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-03-01 DOI: 10.1007/s10948-023-06517-4

Binlong Pan, Huafu Chen, Xiang Li, Nengjun Yu, Minxiang Pan, Yundan Yu, Jieyang Fang, Qiong Wu, Hangfu Yang, Hongliang Ge

{"title":"Magnetic Materials of La2/3-xEuxCa1/3MnO3 Manganites for the Refrigeration Application from 150 to 225 K","authors":"Binlong Pan, Huafu Chen, Xiang Li, Nengjun Yu, Minxiang Pan, Yundan Yu, Jieyang Fang, Qiong Wu, Hangfu Yang, Hongliang Ge","doi":"10.1007/s10948-023-06517-4","DOIUrl":"10.1007/s10948-023-06517-4","url":null,"abstract":"<div><h2>Abstract\u0000</h2><div>The phase structure and magnetic and magnetocaloric effect (MCE) properties have been studied in La2/3-xEuxCa1/3MnO3 (0 ≤ x ≤ 0.08) manganites prepared by conventional solid-state reaction. There is no miscellaneous phase in the samples, which are analyzed by the Rietveld refinement method. The refinement data shows the lattice decreases gradually with smaller radius of Eu3+ substitution. The Curie temperature of the material is continuity distributed from 150 to 225 K. Large magnetic entropy changes (ΔSM) are obtained with Eu3+ substitution, the highest value of −ΔSM is 4.93 J·kg−1 K−1 in the magnetic field change at 2 T, and the relative cooling power (RCP) value is around ~ 110 J·kg−1. The samples undergo a first-order magnetic phase transition with small hysteresis, for x = 0.00, 0.02, when x ≥ 0.4, the samples under a second-order magnetic phase transition. The results show that the substitution of Eu3+ can be used to modify the Curie temperature and obtain a continuous operating temperature interval, without sacrificing the MCE. The large MCE performance, continuous working temperature interval, and high cooling efficiency make our samples be used for the application of magnetic refrigeration.</div></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"939 - 949"},"PeriodicalIF":1.8,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-023-06517-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4042831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

On the Origin of the Lorentz Force: The Second Term of “qv × B” in the Formulation of the Lorentz Force is due to a “Local” Electric Field Predicted by Maxwell’s Equations 论洛伦兹力的起源:洛伦兹力公式中“qv × B”的第二项是由麦克斯韦方程预测的“局部”电场引起的

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-02-25 DOI: 10.1007/s10948-023-06525-4

Mohammad Javanshiry

{"title":"On the Origin of the Lorentz Force: The Second Term of “qv × B” in the Formulation of the Lorentz Force is due to a “Local” Electric Field Predicted by Maxwell’s Equations","authors":"Mohammad Javanshiry","doi":"10.1007/s10948-023-06525-4","DOIUrl":"10.1007/s10948-023-06525-4","url":null,"abstract":"<div>A novel approach to the origin of the second term in the Lorentz force is introduced according to which it is claimed that the said force is due to a local electric field predicted by Maxwell’s equations if, as an auxiliary assumption, every charged fundamental particle of finite size behaves as a perfect conductive material that persists in keeping its intrinsic magnetic field unchanged or behaves as a superconductive material that nullifies any internal magnetic field as the particle is subjected to any external magnetic field. That is, when, say, a charged particle moves through an external uniform magnetic field from left to right so that the velocity is always perpendicular to the magnetic field lines, the infinitesimal displacement of the particle in the distance ahead, along its velocity, and located very close to the right-hand side of the particle causes the external magnetic field to disappear in that very spatial dimensions which are now filled with the particle. On the contrary, the magnetic field appears in an infinitesimally small displacement at the back of the particle and very close to its left-hand side as it leaves the previously occupied space. This disappearance and appearance of the magnetic fields at, respectively, the right- and left-hand sides of the moving particle make some local electric fields appear, circulating the magnetic field lines. It is shown that this model for fundamental particles can predict a considerable portion of the Lorentz force which is thought-provoking. It is also thought-provoking why such a mechanism has been overlooked for nearly 130 years.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"769 - 775"},"PeriodicalIF":1.8,"publicationDate":"2023-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4964073","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

Magnetocaloric Effect Simulation in TbFeSi and DyFeSi Intermetallic Magnetic Alloys Using Mean-Field Model 用平均场模型模拟TbFeSi和DyFeSi金属间磁性合金的磁热效应

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-02-23 DOI: 10.1007/s10948-022-06490-4

Abassi Mounira, N.Zaidi, E. K. Hlil

引用次数: 0

Interfacial Shearing and Transverse Normal Stress in a Superconducting Coated Conductor Strip with Combined Transport Current and Magnetic Field 输运电流和磁场联合作用下超导涂层导体带的界面剪切和横向正应力

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-02-22 DOI: 10.1007/s10948-023-06524-5

Yumei Yang, Haijun Lou

{"title":"Interfacial Shearing and Transverse Normal Stress in a Superconducting Coated Conductor Strip with Combined Transport Current and Magnetic Field","authors":"Yumei Yang, Haijun Lou","doi":"10.1007/s10948-023-06524-5","DOIUrl":"10.1007/s10948-023-06524-5","url":null,"abstract":"<div>The flux-pinning-induced transverse normal stress and interfacial shearing stress are investigated for a long superconducting coated conductor strip combining the transport current and magnetic field. The induced critical current is set to be field independent and the zero field cooling condition is discussed. Based on the plane strain approach, a singular integral equation governing the flux pinning force and interfacial shearing stress is obtained. Then, the different magnetized fields and the influence of the substrate stiffness are also investigated. The results show that the transverse normal stress is unsymmetrical along the direction of strip width. Unusually, an obvious tensile stress appears on one side of the strip as the field increases. Further, this tensile stress increases when the field decreases from its maximum value. It is observed that a stiffer substrate receives a larger tensile normal stress and shearing stress. The results are used to predict the largest possibility of cracking or tearing as the superconducting coated conductor strip is working in an external combined field.</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"821 - 829"},"PeriodicalIF":1.8,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4859555","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

Pinning Centers and Thermally Activated Flux Flow in GdBa2Cu3O7–δ Superconducting Film GdBa2Cu3O7 -δ超导膜中的钉钉中心和热激活磁通流

IF 1.8 4区物理与天体物理

Journal of Superconductivity and Novel Magnetism Pub Date : 2023-02-17 DOI: 10.1007/s10948-023-06527-2

M. J. Keshvani, Ashish Ravalia, D. Venkateshwarlu, V. Ganesan, D. G. Kuberkar

{"title":"Pinning Centers and Thermally Activated Flux Flow in GdBa2Cu3O7–δ Superconducting Film","authors":"M. J. Keshvani, Ashish Ravalia, D. Venkateshwarlu, V. Ganesan, D. G. Kuberkar","doi":"10.1007/s10948-023-06527-2","DOIUrl":"10.1007/s10948-023-06527-2","url":null,"abstract":"<div>Gd1Ba2Cu3O7–δ/SrTiO3 (Gd123/STO) superconductor film (~ 200 nm) was prepared using pulsed laser deposition technique. X-ray diffraction pattern of film reveals the polycrystalline growth with the lattice mismatch ~ 0.25% between the film and substrate. From the resistive behavior, it is clear that Gd123 film exhibits TConset ~ 89 K and TCR = 0 ~ 78 K while mean field TC is ~ 83 K. Temperature dependent resistivity (2–150 K) studies in various applied magnetic fields have been understood on the basis of thermally activated flux flow mechanism. It is observed that the pinning energy decreases with increase in applied magnetic field. To understand the transport mechanism and field effect of magnetic field on the conduction in normal state of film, all the resistivity plots were fitted, where power law is found to increase with increase in applied magnetic field which indicates the field induced enhancement in the inter-band charge carrier scattering in Gd123 film.\u0000</div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"36 3","pages":"813 - 820"},"PeriodicalIF":1.8,"publicationDate":"2023-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4680244","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