Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Half-Metallic Ferromagnetism in UCu2X2 (X = P, As) Zintl Compounds: Exploring the Magnetic Stability, Electronic Structure, Exchange Interactions, and Implications for Next-Generation Storage Technologies","authors":"Sadia Yasin,&nbsp;Dhafer O. Alshahrani,&nbsp;Hayat Ullah,&nbsp;Aijaz Rasool Chaudhry,&nbsp;Ghulam Murtaza","doi":"10.1007/s10948-025-06983-y","DOIUrl":"10.1007/s10948-025-06983-y","url":null,"abstract":"<div><p>The pursuit of half-metallic ferromagnets with 100% spin polarization at room temperature remains an ongoing challenge. This study employs density functional theory to investigate the structural, electronic, and magnetic properties of Zintl compounds UCu₂X₂ (X = P, As). The local density approximation (LDA) and generalized gradient approximation (GGA) have been employed within the full-potential linearized augmented plane wave plus local orbital (FP-LAPW + lo) method as exchange–correlation functionals. Additionally, the GGA + U approach and various versions of the modified Becke-Johnson (mBJ) potential were utilized to obtain more accurate results. Notably, the calculated lattice constants and c/a ratio for UCu₂P₂ are in excellent agreement with experimental values. The results confirm the thermodynamic stability and robust atomic interactions of these compounds. It is discovered that all UCu₂X₂ (X = P, As) Zintl compounds achieve their lowest ground state energy in the FM state as compared to the NM state. Electronic structure calculations reveal that UCu₂X₂ exhibits half-metallic behavior, characterized by 100% spin polarization, an indirect band gap of 0.7 eV, and strong hybridization between X-s/p and U-f/d states. The compounds also display spin gapless semiconducting behavior and double exchange interaction, validating their half-metallic ferromagnetic nature. The ferromagnetism is primarily attributed to the appearance of one 5d-electron outside the final rare earth element’s filled 14-electron 4f shell. The U and Cu atoms contribute most significantly to the total magnetic moment, with minor contributions from interstitial regions. The presence of integer magnetic moments further corroborates the half-metallic ferromagnetic nature of UCu₂X₂, providing clear evidence of this phenomenon. The computed Curie temperatures are 0.0116 × 10⁵ K and 0.0323 × 10⁵ K for UCu₂P₂ and UCu₂As₂, respectively. These findings highlight the potential of UCu₂X₂ for applications in next-generation storage devices and spintronics, offering a promising avenue for further research and development.\u0000</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143932334","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}

{"title":"Peculiarities of Superconductive Phase in Nanographite Films","authors":"Lebedev S. G.","doi":"10.1007/s10948-025-06976-x","DOIUrl":"10.1007/s10948-025-06976-x","url":null,"abstract":"<div><p>Report describes some unconventional electromagnetics properties of nanographite (NG) films which resemble room temperature superconductivity. NG film is the composite of 20–30 Å graphite clusters embedded in amorphous matrix. At such a small dimension, the superconductivity can be explained by the attraction of all electrons to all kernels of atoms constituting the graphite cluster. Possibilities of room temperature weak superconductivity in nanographite films are supported by the observation of reversed Josephson Effect (which is the transformation of microwave irradiation falling on the sample into the direct current through this sample) and its temperature dependence. This dependency is fully reminiscent of the behavior of known superconductors. Another effect is switching conductivity from high to very small value at some critical current (which can be used in electrical switchers), pinning of vortices on columnar topological structure of film observed in magnetic force microscope. In the article, an attempt is made to explain the appearance of coherent optical radiation upon conductivity switching in nanographite films by the movement of magnetic vortices and the thermomagnetic instability of their magnetic structure. Under the effort to find the state of global phase coherence in the nanographite films, the Josephson current at room temperature was detected, to the best of our knowledge, for the first time, when measuring the current–voltage characteristics.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143913943","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}

{"title":"Rhombohedral Ba2NbBO6 (B = As, Sb, and Bi) Double Perovskites’ Elastic, Thermodynamic, and Directional Thermoelectric Properties","authors":"Saber Saad Essaoud,&nbsp;Missoum Radjai,&nbsp;Abdelmadjid Bouhemadou,&nbsp;Mohammed Elamin Ketfi,&nbsp;Djamel Allali,&nbsp;Rabah Khenata,&nbsp;Yarub Al-Douri","doi":"10.1007/s10948-025-06981-0","DOIUrl":"10.1007/s10948-025-06981-0","url":null,"abstract":"<div><p>We systematically analyzed the elastic, thermodynamic, and directional thermoelectric properties of a set of double perovskites, specifically Ba₂NbAsO₆, Ba₂NbSbO₆, and Ba₂NbBiO₆. We investigated the dependence of volume, bulk modulus, thermal expansion coefficient, Debye temperature, entropy, isobaric and isochoric heat capacities, and lattice thermal conductivity on temperature and pressure using the quasi-harmonic Debye model. We analyzed the thermoelectric parameters, including the Seebeck coefficient, thermal and electrical conductivity of holes and electrons, figure of merit, and power factor, in the <i>xx</i>, <i>yy</i>, and <i>zz</i> directions, through the quasi-classical Boltzmann model. The findings demonstrate a figure of merit exceeding 0.8 across a wide range of charge carrier concentrations and a Seebeck coefficient greater than 0.9 mV/K, making Ba₂NbAsO₆, Ba₂NbBiO₆, and Ba₂NbSbO₆ compounds promising candidates for heat-to-electricity conversion applications. We assessed the mechanical stability and characteristics, including bulk modulus, shear modulus, Young’s modulus, Poisson’s ratio, Debye temperature, and the velocities of longitudinal, transverse, and average sound propagation, derived from the single-crystal elastic constants <i>C</i>_ij, which were evaluated numerically using the strain-stress technique.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143919039","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}

{"title":"Chaotic Dynamics in Spin Torque Nano-oscillator Driven by Voltage Feedback","authors":"Meenakshi Sravani,&nbsp;Swapnil Bhuktare","doi":"10.1007/s10948-025-06980-1","DOIUrl":"10.1007/s10948-025-06980-1","url":null,"abstract":"<div><p>Non-linear dynamics, including auto-oscillations, chaotic dynamics, and synchronization, are integral to physical and biological applications and can be excited in spintronic devices. In this study, we are interested in exploring the excitation of chaos using voltage feedback in a spin torque nano-oscillator using a Magnetic Tunnel Junction (MTJ). According to the Poincaré-Bendixson theorem, chaos cannot arise in a two-dimensional system of MTJ featuring two dynamic variables describing the zenith and azimuth angles of magnetization. Hence, we prefer the feedback system as it creates a multi-dimensional system, making it interesting to explore the emergence of chaos in such systems. Such feedback is achieved by utilizing a 3-terminal device consisting of an MTJ with an in-plane pinned layer (PL) and an out-of-plane free layer (FL) geometry. When a DC current above the critical threshold is applied, the FL’s oscillating magnetization generates an AC output voltage through the Tunnel Magneto Resistance (TMR) effect. A fraction of this voltage, fed back after a delay, modulates the FL’s anisotropy via voltage controlled magnetic anisotropy (VCMA) effect, potentially driving chaotic dynamics or oscillator death based on the feedback delay and gain of the feedback circuit. The observed chaotic regime has been studied by evaluating the Lyapunov exponent, bifurcation diagrams, Fourier spectral analysis, and reconstruction of the trajectory in embedding phase space. Such observed chaotic dynamics can find practical applications in random number generators and physical reservoir computing.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904832","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}

{"title":"Critical Behavior, Phenomenological Model, Electrical and Dielectric Properties of La0.67−xPrxBa0.33MnO3 (x = 0.1 and 0.2) Manganites","authors":"Ameni Hidri,&nbsp;Latifa ben ammar,&nbsp;M. Nasri,&nbsp;J. Khelifi,&nbsp;E. K. Hlil","doi":"10.1007/s10948-025-06977-w","DOIUrl":"10.1007/s10948-025-06977-w","url":null,"abstract":"<div><p>In this study, we examined the magnetic and electrical properties of sol–gel-prepared polycrystalline manganites La_{0.67−<i>x</i>}Pr_<i>x</i>Ba_0.33MnO₃ (<i>x</i> = 0.1 and 0.2). The temperature-dependent magnetization reveals that as the temperature decreases, the samples undergo a second-order phase transition from the paramagnetic to the ferromagnetic state. We explore the correlation between experimental findings and theoretical analysis based on phenomenological models that effectively simulate magnetic and magnetocaloric measurements. The predicted maximum magnetic entropy change (Δ<i>S</i>_max) under a 5 T magnetic field is 5.8 J kg⁻¹ K⁻¹ for <i>x</i> = 0.1 and 3.33 J kg⁻¹ K⁻¹ for <i>x</i> = 0.2. Furthermore, we estimate the relative cooling power and specific heat capacity, suggesting that these compounds could be promising candidates for magnetic refrigeration at low temperatures. In addition, the electrical characteristics of La_{0.67−<i>x</i>}Pr_<i>x</i>Ba_0.33MnO₃ (<i>x</i> = 0.1 and <i>x</i> = 0.2) were investigated over a wide range of temperatures (120 to 380 K) and frequencies (40 to 10⁷ Hz) by means of impedance spectroscopy. A transition from semiconducting to metallic behavior is observed at 300 K. Charge carrier hopping between Mn³⁺ and Mn⁴⁺ ions has also been explored with regard to its effects on frequency, temperature, and composition, particularly in relation to permittivity (<i>ε</i>′, <i>ε</i>″) and dielectric loss (tan <i>δ</i>).</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908848","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}

{"title":"Prediction and Application of Critical Current in 2G HTS Conductors Based on GA-BP Algorithm","authors":"Nipeng Wang,&nbsp;Wenhai Zhou,&nbsp;Rui Liang,&nbsp;Rongli Jia,&nbsp;Bingxu Su,&nbsp;Tingliang Chen,&nbsp;Leiwen Yue,&nbsp;Jiafeng Cao","doi":"10.1007/s10948-025-06975-y","DOIUrl":"10.1007/s10948-025-06975-y","url":null,"abstract":"<div><p>Critical current, as a key parameter distinguishing superconductors from ordinary conductors, determines the stability of superconducting devices and systems during operation. To accurately assess the critical performance of superconductors, a genetic algorithm (GA)–optimized back-propagation (BP) neural network model is introduced and used in this paper to predict the critical currents of second-generation high-temperature superconductors (2G HTS). Firstly, a staged optimization is carried out for the neural network structure and hyper-parameters, and the GA-BP model is established by constructing different fitness functions. Next, the prediction accuracy and generalization ability of the GA-BP model are validated by comparing the relative errors between the predicted values from two models in the 180° to 240° anti-angle region. Eventually, the critical current at a specific temperature is predicted by the GA-BP model, and the corresponding <i>J</i>_<i>c</i>0 is calculated for the finite element calculation of superconducting strips. The calculation results show that the relative error between the maximum current density obtained based on the predicted <i>J</i>_<i>c</i>0 and the experimental <i>J</i>_<i>c</i>0 is only 0.907%, indicating that the model can be used to accurately determine the operating state of the superconducting equipment.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143904851","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}

{"title":"Evidence of Surface Biasing and Multiferroic Properties in Ferroelectric (BNT)-Ferrimagnetic (LFO) Nanocomposites","authors":"Bineet Kumar,&nbsp;Lagen Kumar Pradhan,&nbsp;Amar Dev,&nbsp;Amrish K. Panwar,&nbsp;Manoranjan Kar","doi":"10.1007/s10948-025-06973-0","DOIUrl":"10.1007/s10948-025-06973-0","url":null,"abstract":"<div><p>The lead-free composite (1-x)Bi_0.5Na_0.5TiO₃-(x)LaFeO₃ with chemical composition [<i>x</i> = 0.00, 0.02, 0.04, 0.06, 0.08 and 1.00] has been prepared via the double step solid-state reaction method. The X-ray diffraction (XRD) patterns of the composites indicate its crystalline nature and indexed with rhombohedral (<i>R3c</i>) and orthorhombic (<i>Pbnm</i>) crystal symmetries. The Rietveld refinement of XRD patterns has been used to estimate the various crystal structure parameters. The microstructure of the composites indicates the non-homogeneous distribution of grains with different sizes. The dispersive nature of the frequency dependent dielectric properties is observed in the present composites. The temperature-dependent dielectric constant of the composites exhibits the relaxor behavior. The ferroelectric and magnetic properties of the composites describe its multiferroic behavior. The dielectric, ferroelectric, and magnetic properties of the present composites have been correlated with the multiferroic behavior.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143900718","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}

{"title":"The Effect of Structural Disorder on Magnetic Properties of Fe-Ga Alloys: Insights from Ab Initio and Monte Carlo Calculations","authors":"M. A. Zagrebin,&nbsp;M. V. Matyunina,&nbsp;Yu. S. Tarasova,&nbsp;V. V. Sokolovskiy,&nbsp;V. D. Buchelnikov","doi":"10.1007/s10948-025-06979-8","DOIUrl":"10.1007/s10948-025-06979-8","url":null,"abstract":"<div><p>In this study, we investigate the effect of structural disorder on structural, elastic, and magnetic properties of Fe<span>(_{100-x})</span>Ga<span>(_x)</span> (<span>(x = 3.7, 5.5, 9.3)</span> at.%) alloys in the <i>A</i>2 phase by means of the density functional theory and Monte Carlo simulations. For each composition of Ga, ten configurations with a random arrangement of non-magnetic atoms in the <i>A</i>2 structure were generated. Calculations performed using the density functional theory have shown that, depending on the localization of atoms in the calculation cell, the calculated equilibrium volume of the unit cell per atom can either increase or decrease, which affects the magnitude of the magnetic moment per Fe atom. The elastic moduli, obtained in this work, has the same trend as observed in experiment. The magnetic exchange interaction between nearest neighbor Fe pair is ferromagnetic and about 22–25 meV. By using the long-range exchange interactions between magnetic atoms in the classical Heisenberg Hamiltonian, we have simulated the temperature dependencies of magnetization for Fe<span>(_{100-x})</span>Ga<span>(_x)</span> alloys at zero magnetic field and estimated Curie temperatures. By using the long-range exchange interactions between magnetic atoms in the classical Heisenberg Hamiltonian, we have simulated the temperature dependencies of magnetization for Fe<span>(_{100-x})</span>Ga<span>(_x)</span> alloys at zero magnetic field. It was shown that the Curie temperature is directly related to the values of the magnetic exchange parameter and demonstrates an increasing dependence. The following results were obtained for the studied compounds: 1138 K for Fe<span>(_{96.3})</span>Ga<span>(_{3.7})</span>, 1185 K for Fe<span>(_{94.5})</span>Ga<span>(_{5.5})</span>, and 1267 K for Fe<span>(_{90.7})</span>Ga<span>(_{9.3})</span>.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143892764","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}

{"title":"Single Crystal Growth and Magnetic Properties of Trigonal Phase HoAl(_{3})","authors":"Junbao He,&nbsp;Xuechao He,&nbsp;Bo Liu,&nbsp;Jianyu Li,&nbsp;Shishi Ma,&nbsp;Xinyue Li,&nbsp;Yu Fu,&nbsp;Congbin Liu,&nbsp;Yuqi Chen,&nbsp;Yongsong Luo,&nbsp;Hui Liang,&nbsp;Hao Shi","doi":"10.1007/s10948-025-06974-z","DOIUrl":"10.1007/s10948-025-06974-z","url":null,"abstract":"<div><p>We have successfully grown single crystalline trigonal-type HoAl<span>(_{3})</span> sample and comprehensively investigated the magnetic and magnetocaloric properties of both the single crystalline and powder samples. Magnetic susceptibility and specific heat measurements reveal that trigonal HoAl<span>(_{3})</span> develops an antiferromagnetic order at <span>(T_{N})</span> = 9 K and this order can be continuously suppressed by an external magnetic field. Influenced by crystal electric field effect, HoAl<span>(_{3})</span> possesses obvious magnetic anisotropy in paramagnetic state. The direction-dependent correlation of magnetic susceptibility, magnetic anomaly under specific magnetic fields, and magnetic field-induced magnetic transition suggest the magnetic easy axis tends to parallel to the <i>ab</i>-plane. The magnetic entropy change in isothermal process reflects that the magnetocaloric effect is almost isotropic.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879595","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}

{"title":"Anisotropic Upper Critical Field in Nd1.85Ce0.15CuO4±δ Superconducting Thin Films","authors":"N. Radhikesh Raveendran,&nbsp;Vinita Kumawat,&nbsp;E. P. Amaladass,&nbsp;A. T. Sathyanarayana,&nbsp;T. Geetha Kumary,&nbsp;Awadhesh Mani","doi":"10.1007/s10948-025-06950-7","DOIUrl":"10.1007/s10948-025-06950-7","url":null,"abstract":"<div><p>Thin films of superconducting Nd_1.85Ce_0.15CuO_4±δ were synthesized by a pulsed laser deposition method followed by ex situ annealing in an argon atmosphere. Structural, morphological and electrical characterizations were performed using X-ray diffraction, scanning electron microscopy and temperature-dependent resistivity measurements respectively. X-ray analysis reveals preferential orientation in (001) and (110) directions for the thin films. Resistivity measurements demonstrated a pronounced superconducting behavior in the argon annealed thin films. The critical superconducting properties, the upper critical field and critical current density, were investigated using magneto-transport and magnetization measurements. The anisotropic coefficient which is the ratio of the upper critical field parallel and perpendicular to that of <i>ab</i> plane has been assessed highlighting the significant anisotropy of the Nd_1.85Ce_0.15CuO_4±δ superconductor. The analysis of the activation energy reveals the three-dimensional nature of the vortex lattice in this system.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06950-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143875384","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}