Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Effect of Al3+ Doping on the Microstructure and Magnetic Behavior of CoFe2O4 Nanoparticles","authors":"Vaibhav K. Kashte,&nbsp;Vishal Ashok Pandit,&nbsp;Nilkanth N. Kapse,&nbsp;Dinesh Rathod,&nbsp;Bhagwan G. Toksha","doi":"10.1007/s10948-024-06892-6","DOIUrl":"10.1007/s10948-024-06892-6","url":null,"abstract":"<div><p>This is the study of CoFe₂O₄ and CoAl_0.2Fe_1.8O₄ 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.</p></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}

{"title":"Effect of the Width of Microbridge on the Characteristics of YBCO Step-Edge Josephson Junction","authors":"Sandeep Kumar,&nbsp;Neeraj Khare","doi":"10.1007/s10948-025-06904-z","DOIUrl":"10.1007/s10948-025-06904-z","url":null,"abstract":"<div><p>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 <i>I</i>_c is not as sharp as the increase in the <i>R</i>_n value, which leads to the enhanced values of the <i>I</i>_c<i>R</i>_n 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 <i>I</i>_c<i>R</i>_n product with <i>I</i>_c and 1/<i>R</i>_n 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 <i>I</i>_c<i>R</i>_n 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.</p></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}

{"title":"Study of Ferrimagnetic Bond-diluted Ising-like Octahedral and Double Tetrahedral Chains with Multi-spin Interactions","authors":"M. Mouhib,&nbsp;A. El Fadl,&nbsp;S. Bri,&nbsp;H. Mounir,&nbsp;M D. Belrhiti","doi":"10.1007/s10948-025-06905-y","DOIUrl":"10.1007/s10948-025-06905-y","url":null,"abstract":"<div><p>We herein treat using the finite cluster approximation (FCA), two defective octahedral and double-tetrahedral chain-like structures with multi-spin interactions, where the nodal and the square (or triangular) cluster sites are occupied respectively by spin-3/2 and spin-1/2. The impact of the bond concentration p and the multi-spin interactions (J₄, J₃) on the phase diagrams and magnetizations has been thoroughly examined. First, by discarding multi-spin interactions, the second-order transition consistently manifests with the possibility of compensation behavior only for the double-tetrahedral chain under feeble dilution. Interestingly, the insertion of multi-spin interactions plays a relevant role in the appearance of the compensation phenomena with a multitude of T_comp profiles. In addition, a variety of interesting features such as horizontal reentrance and tricritical behavior emerge. Finally, at low temperatures according to p and J₄ (or J₃) strength, the order is even stable (T_c ≠ 0) or will be destroyed (T_c = 0) at a critical threshold p_c.</p></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":"143108975","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":"Indentation Effects on Critical Performance of the New Developed WST High Jc Nb3Sn Strand","authors":"Yunhao Liu,&nbsp;Peng Gao,&nbsp;Yu Wu,&nbsp;Arend Nijhuis,&nbsp;Zichuan Guo,&nbsp;Yi Shi,&nbsp;Fang Liu,&nbsp;Chao Dai,&nbsp;Jinggang Qin","doi":"10.1007/s10948-024-06867-7","DOIUrl":"10.1007/s10948-024-06867-7","url":null,"abstract":"<div><p>To provide candidate materials for the high-field winding-package (WP) of the toroidal field coil (TF) in next-generation Chinese compact burning plasma tokamak, Western Superconductor Technology Co., Ltd (WST) has newly developed a type of high J_c Nb₃Sn wire with restacked-rod process (RRP) of the distributed barrier layout. To avoid the conductor degradation during electromagnetic and thermal cycling, the high-field WP is designed as a short-twist-pitch (STP) cable. After cabling and compaction of conductor, the STP design can cause severe indentation damage to the strands. The indentation not only impact the transport performance of the strand, in the meantime impact the thermo-magnetic stability. To investigate the effect of indentation on the performance for the WST high J_c Nb₃Sn strand, series measurements were carried out. In this paper, the critical current (I_c) measurement, residual resistance ratio (RRR) measurement, magnetization measurements, and V-I tests were performed on indented samples, and the results were compared with other two types of high J_c Nb₃Sn strands used in high-field WP. It was shown that the critical performance of the samples decreased significantly at an indentation depth of 0.4 mm, and the RRR value decreases with increasing indentation depth.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995603","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":"Understanding of Strain Condition Effects on Physical Properties of the Bi2Se3 Compound by the DFT Method","authors":"A. Jabar,&nbsp;O. Abounachit,&nbsp;S. Idrissi,&nbsp;L. Bahmad","doi":"10.1007/s10948-025-06912-z","DOIUrl":"10.1007/s10948-025-06912-z","url":null,"abstract":"<div><p>This study investigated the structural, electronic, optical, thermodynamic, and thermoelectric properties of the Bi₂Se₃ compound when strains along distinct crystallographic directions. This compound showed a p-type semiconductor nature with a bandgap of 0.77 eV. The anisotropic behavior of the material has also been examined, providing insights into potential applications in various fields. We employed the density functional theory (DFT) under the Wien2k package. The calculations utilized the LSDA (local spin density approximation) and mBJ (modified Becke-Johnson) local density approximation functionals to handle exchange–correlation interactions. The study covered a range of characteristics, including heat capacity, Debye temperature, lattice thermal conductivity, and optical properties including the absorption coefficient, the electron energy loss, the refractive index, and the optical conductivity as well as the dielectric tensor’s real and imaginary components. The thermoelectric properties including the Seebeck coefficient, electrical conductivity, electronic contribution to thermal conductivity, and calculated power factors have been deduced and discussed.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995514","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":"A DFT Study on the Effects of Changing Transition Metals (Fe, Ru and Os) in Neodymium Phosphide Skutterudites NdTr4P12: Structural, Elastic, Thermodynamic, Electronic, Magnetic, Optical and Thermoelectric Properties","authors":"Tanmay Chaki,&nbsp;Pradip Kumar Mandal","doi":"10.1007/s10948-025-06913-y","DOIUrl":"10.1007/s10948-025-06913-y","url":null,"abstract":"<div><p>Several important ground state properties—structural, elastic, thermodynamic, electronic, magnetic, optical, and thermoelectric properties—of three neodymium-filled skutterudites NdTr₄P₁₂ (Tr = Fe, Ru, and Os) have been investigated using PBE-GGA exchange-correlation potential under the DFT method and Boltzmann transport theory. The effect of changing transition metals on these properties has been explored. Some of the physical parameters increase systematically with increasing atomic number (z) of the transition metals, while some other parameters exhibit a reverse trend. Although the band structure and DOS reveal their metallic nature, near the Fermi level total DOS are different in both spin channels. The materials are ferromagnetic and the magnetic moment of the compounds increases with z. The static dielectric constants also increase with z whereas the refractive indices in the optical frequency range decrease with z. The materials have high reflectivity and low absorption near the Fermi level and within the 0 – 5 eV spectral range, metal-insulator-metal type transition is seen in all. The thermoelectric figure of merit (ZT) increases fast with temperature but shows no systematic variation with z. In the high temperature range NdOs₄P₁₂ shows the maximum ZT value, followed by the ruthenium and iron compounds.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995515","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":"Tuning the Magnetic Behavior of BaBiO3 Nanoparticles by Pb Doping","authors":"K. V. Shilna,&nbsp;K. J. Thomas","doi":"10.1007/s10948-024-06849-9","DOIUrl":"10.1007/s10948-024-06849-9","url":null,"abstract":"<div><p>Over the last few years, researchers have been seeking novel oxide materials with room-temperature ferromagnetic properties for use in spintronics devices. In a recent work, we have reported room temperature ferromagnetic correlations in BaBiO₃ nanoparticles which is non-magnetic in its bulk form. Here we have conducted a systematic study of the magnetic behavior by controlled Pb doping. We observe an increase in magnetic saturation for small Pb doping concentration (~ 1%), this is believed to be due to the strain magnetism induced by doping. Upon further increase in the doping concentration, the ferromagnetic behavior has been found diminished in a controlled manner, which indicates the dominance of non-magnetic ion distribution over strain magnetism.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995251","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":"Hall Coefficient of the Intercalated Graphite CaC(_6) in the Uniaxial CDW Ground State","authors":"Petra Đurkas Grozić,&nbsp;Barbara Keran,&nbsp;Anatoly M. Kadigrobov,&nbsp;Zoran Rukelj,&nbsp;Ivan Kupčić,&nbsp;Danko Radić","doi":"10.1007/s10948-025-06910-1","DOIUrl":"10.1007/s10948-025-06910-1","url":null,"abstract":"<div><p>We evaluate the Hall coefficient characterising magnetotransport in an intercalated graphite CaC<span>(_6)</span> with the Fermi surface reconstructed by an uniaxial charge density wave from closed pockets to open sheets. As the typical order parameter, corresponding to the pseudo-gap in electronic spectrum and consequently to spacing between electron trajectories in reciprocal space, is of the order of <span>(10^2)</span>K, magnetic breakdown in strong experimentally achievable fields of the order of 10T is inevitable. The classical expressions for the components of the magnetoconductivity tensor are strongly modified by magnetic field-assisted over-gap tunneling causing quantum interference. Due to magnetic breakdown, all magnetoconductivity components undergo strong quantum oscillations reflected in the Hall coefficient. In their nature, these are different than standard Shubnikov de Haas oscillations which would not appear in a system with an open Fermi surface.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995326","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":"A Facile Approach of Synthesizing Biogenic Copper Ferrite Nanoparticles: Characterization, Evaluation of Their Impact on Reducing Oxidative Stress-Induced Pathogenesis, and Human Breast Cancer Proliferation","authors":"Shivakumar Venkataramaiah,&nbsp;Manjula M. Venkatappa,&nbsp;Sujatha M. Hanumegowda,&nbsp;Chikkappa Udagani,&nbsp;Ihab Mohamed Moussa,&nbsp;Eman A. Mahmoud,&nbsp;Devaraja Sannaningaiah","doi":"10.1007/s10948-025-06906-x","DOIUrl":"10.1007/s10948-025-06906-x","url":null,"abstract":"<div><p>Plant-mediated nanoparticles gaining importance due to their broad spectrum of pharmacological applications in comparison to the synthetic drugs. The nanoparticles amalgamated using plant extracts have been receiving much attention due to the robust phytochemicals and therapeutic potential. Thus, we herein report the biosynthesis and pharmacological evaluation (anti-oxidant, anti-inflammatory, anti-platelet, and anti-cancer properties) of <i>Decalepis hamiltonii</i> leaves extract copper ferrite nanoparticles (<i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs). The characterization of <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs was carried out using Powder X-ray diffraction (<i>PXRD</i>), Fourier transform infrared spectroscopy (<i>FTIR</i>), Scanning electron microscopy (<i>SEM</i>), Energy-dispersive X-ray analysis (<i>EDAX</i>), High-resolution transmission electron microscopy (<i>HR-TEM</i>), and Vibrating sample magnetometer (<i>VSM</i>). <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs exhibited anti-oxidant activity by scavenging 1,1-diphynyl-2-picrylhydrazyl (DPPH) radicals (66.46%) and reduced ferric to ferrous ions at the concentration of 150 μg/mL. Furthermore, <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs restored the NaNO₂-induced oxidative stress markers such as lipid peroxidation, protein carbonyl content, total thiol, and anti-oxidant enzyme (catalase and super oxide dismutase) activities in RBCs. <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs were non-toxic as it did not cause RBCs lysis, while it exhibited anti-inflammatory activity by inhibiting heat-induced hemolysis, egg albumin, and bovine serum albumin denaturation. In addition, <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs inhibited ADP and epinephrine-induced platelet aggregation. Most importantly, <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs showed anti-cancer potential by eliciting cytotoxic effect to MCF-7 cells in a dose-dependent manner. Further, <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs caused apoptosis to MCF-7 cells which was confirmed by annexin V/PI staining test and flow cytometer. In conclusion, <i>DHLE-CuFe</i>_<i>2</i><i>O</i>_<i>4</i> NPs regulate oxidative stress-induced red blood cell damage, thrombosis, inflammation, and MCF-7 cells growth.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995250","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":"Key Properties of La2CuO4 and YBa2Cu3O6 – Specific Type of Chemical Bonding and Lenear Magnetoelectric Effect, Promoting the Emergence of Superconductivity in Unconventional High-Temperature Superconductors","authors":"Valery G. Orlov,&nbsp;Gregory S. Sergeev","doi":"10.1007/s10948-025-06907-w","DOIUrl":"10.1007/s10948-025-06907-w","url":null,"abstract":"<div><p>Two principal physical properties of La₂CuO₄ and YBa₂Cu₃O₆ are identified, which can promote the emergence of superconductivity in unconventional high-temperature superconductors. The first property is a specific type of chemical bonding stimulating fluctuations of the charge density. To reveal it, it is necessary to carry out calculations of the electronic band structure and find the parameters of critical points in the charge density distribution in the crystal. For calculation of the electronic band structure of YBa₂Cu₃O₆ the same approach was applied, which we earlier used for the study of the electronic band structure of La₂CuO₄ and high-temperature superconductors: computer program WIEN2k and exchange potential of Becke and Johnston modified by Tran and Blaha. Such approach allowed us to obtain the antiferromagnetic ground state for the compound YBa₂Cu₃O₆ with a band gap <i>E</i>_g = 1.5 eV and a magnetic moment on copper atoms <i>M</i>_Cu = 0.71 <i>μ</i>_B. It turned out that YBa₂Cu₃O₆ compound has a type of chemical bonding similar to that which we found earlier in La₂CuO₄ and in high-temperature superconductors. Consideration of the symmetry properties of the crystal structures of the La₂CuO₄ and YBa₂Cu₃O₆ compounds revealed a second characteristic property of them – the existence of magnetic crystal classes that admit a linear magnetoelectric effect. This effect allows the simultaneous existence of local magnetic fields and electric polarization in the sample. Based on two identified characteristic physical properties of the La₂CuO₄ and YBa₂Cu₃O₆ compounds, a roadmap is proposed for a search of new parent substances for obtaining unconventional high-temperature superconductors.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-01-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142995150","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}