Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Effect of Nonuniform Morphology and Crystalline Structure on the Effective Magnetic Anisotropy in Fe, Co, and Ni Nanowire Arrays","authors":"M. I. Sobirov,&nbsp;A. Yu. Samardak,&nbsp;S. A. Satsuk,&nbsp;K. A. Rogachev,&nbsp;N. A. Ognev,&nbsp;G. A. Leyko,&nbsp;A. O. Lembikov,&nbsp;S. M. Pisarev,&nbsp;S. V. Komogortsev,&nbsp;A. V. Ognev,&nbsp;A. S. Samardak","doi":"10.1007/s10948-024-06890-8","DOIUrl":"10.1007/s10948-024-06890-8","url":null,"abstract":"<div><p>The phenomenon of shape anisotropy predominantly constitutes the principal factor influencing effective anisotropy, serving as a significant determinant of the magnetic characteristics of one-dimensional ferromagnetic nanostructures, materials that hold substantial promise for a diverse array of applications in the domains of electronics and biomedicine. However, it is noteworthy that effective anisotropy may be modulated through the manipulation of various other forms of anisotropy, thereby facilitating the tuning of the magnetic properties of nanowire arrays without necessitating alterations to their spatial curvature. In this study, we elucidate the characteristics of nanowire arrays with varying lengths and compositions, which have been electrochemically synthesized utilizing identical porous templates. Through a range of experimental methodologies, we establish a correlation between atypical magnetic behavior and the underlying morphology and crystalline structure of the nanowires. We attribute the pronounced magnetostatic interactions observed within cobalt (Co) nanowires to the presence of significant local uniaxial magnetocrystalline anisotropy, along with a nanostructure oriented perpendicular to the longitudinal axis of the nanowire. Furthermore, we examine the repercussions of substantial discrepancies in the lengths of iron (Fe) nanowires on the magnetostatic field distribution. Our analysis employs mean field theory, incorporating the contributions of various anisotropies present within the system, as well as the non-uniform lengths of the nanowires. Ultimately, through micromagnetic simulations, we investigated the stray fields present within the nanowire array and delineated how strong magnetocrystalline anisotropy and the variability in length affect their spatial distribution.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889505","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 Magnetic NiO Nanoparticles on Pinning Properties of YBa2Cu3O7-x Superconductor","authors":"Rajni Kandari,&nbsp;Mamta Dahiya,&nbsp;Mohd Faraz,&nbsp;Neeraj Khare","doi":"10.1007/s10948-024-06885-5","DOIUrl":"10.1007/s10948-024-06885-5","url":null,"abstract":"<div><p>In the present work, we report the effects of incorporating magnetic Nickel oxide (NiO) nanoparticles in YBa₂Cu₃O_7-x (YBCO), on the superconducting properties of the YBCO nanocomposite. The NiO was prepared by auto-combustion method and exhibited ferromagnetic nature at room temperature. The polycrystalline YBCO and its nanocomposites with NiO nanoparticles were synthesized using the solid-state reaction method. The addition of magnetic NiO nanoparticles in YBCO resulted in improved critical current density and flux pinning force in the measured range of temperature and magnetic fields. The observed high pinning at a lower field is attributed to the magnetic interaction of vortices with the NiO nanoparticles. At 60 K, the enhancement in critical current density of YBCO nanocomposite is ~ 1.7 times for low applied field, and ~ 1.2 times for high applied field, compared to the YBCO superconductor. The presence of NiO in the YBCO matrix also created more defects in YBCO, which enhanced the pinning properties and remained effective even at higher magnetic fields.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889658","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":"Structural and Electrical Properties of Al3+ Substituted Cobalt Ferrite Nanoparticles for Improved Antibacterial Activity","authors":"Wafaa A. Shatti,&nbsp;Zena M. A. Abbas,&nbsp;Ali M. Mohammad,&nbsp;Sulaf M. Mohammed","doi":"10.1007/s10948-024-06851-1","DOIUrl":"10.1007/s10948-024-06851-1","url":null,"abstract":"<div><p>Nanomaterials show strong potential for antibacterial treatments by targeting various bacterial strains and bypassing resistance through mechanical cell damage. This occurs when nanoparticles interact with bacterial cell walls, compromising their structural integrity. These mechanisms highlight nanomaterials as effective tools in combating infections. Using the sol–gel method, this study synthesized Co_1-<i>x</i>Al_<i>x</i>Fe₂O₄ nanoferrites (<i>x</i> = 0.0, 0.2, 0.4, 0.6, 0.8). This study examines the effects of substituting trivalent Al³⁺ ions on cobalt ferrite nanoparticles’ structural and electrical properties and their antibacterial activity. X-ray diffraction confirmed the formation of Co_1-<i>x</i>Al<i>ₓ</i>Fe₂O₄ nanoferrites in the <span>(Fdoverline{3 }m)</span> space group, showing a shift towards lower 2<i>θ</i> angles in the (311) plane as Al³⁺ content increased. The crystal size reached 29.04 when (<i>x</i> = 0.0 and 0.4) and decreased to 25.29 when (<i>x</i> = 0.8). Fourier transform infrared spectroscopy identified absorption band characteristic of the cubic spinel structure, while field emission-scanning electron microscopy revealed polyhedral nanoparticles clustered in nanoscale formations. Particle sizes ranged from 37.21 nm at <i>x</i> = 0.4 to 31.11 nm at <i>x</i> = 0.8. A decrease in dielectric properties with increasing frequency was consistent with the Maxwell–Wagner model and Koops’ theory, while AC conductivity increased as charge carrier mobility rose with frequency. Antibacterial tests using the Agar well diffusion method showed that <i>Escherichia coli</i> was the most sensitive strain, followed by <i>Klebsiella</i> spp., with <i>Streptococcus</i> spp. Displaying the highest resistance. Nanoparticles at <i>x</i> = 0.8 demonstrated the most potent antibacterial activity. Overall, the results highlight that cation substitution within the cubic spinel lattice significantly impacts the structural, electrical, and antibacterial properties of cobalt ferrite nanoparticles.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889656","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":"Structural and Mechanical Dynamics of Y-358 Superconductors Influenced by Tb/Y and Zn/Cu Substitutions","authors":"O. Ozturk,&nbsp;G. Guducu,&nbsp;S. Kurnaz,&nbsp;T. Seydioglu,&nbsp;S. Safran","doi":"10.1007/s10948-024-06865-9","DOIUrl":"10.1007/s10948-024-06865-9","url":null,"abstract":"<div><p>The search for superconductors with superior mechanical properties has driven research into homovalent replacements. In this work, we have systematically incorporated Tb/Y and Zn/Cu dopants into Y_3-x(Tb)_xBa₅Cu₈O_18-δ and Y₃Ba₅Cu_8-x(Zn)_xO_18-δ based bulk superconductors using the sol-gel technique. Our goal was to explore the fundamental mechanisms linking dopant concentration (0–15%), substitution, processing, and mechanical performance. Understanding these mechanisms can help in designing robust and high-performance superconducting materials for various technological applications. The samples were extensively investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), Vickers hardness measurements and related calculations. The hardness data were further evaluated using Meyer’s law, the proportional sample resistance (PSR) model, the elastic/plastic deformation (EPD) model, the Hays-Kendall (HK) approach, and the indentation-induced cracking (IIC) model. This study reveals the fundamental changes in the properties of Y-358 superconductors due to Tb/Y and Zn/Cu substitutions. The interpretation of the XRD study results leads to the conclusion that all samples have an orthorhombic crystal structure. XRD results confirmed that all samples maintained an orthorhombic crystal structure. However, significant XRD peaks indicated that Tb doping above 10% introduced impurities. Additionally, micromechanical studies demonstrated that hardness values in the plateau region consistently decreased as Tb and Zn doping ratios increased. A decrease in hardness values with increasing applied load, known as the indentation size effect (ISE), was also observed. Among the modeling techniques applied, the IIC model provided the best fit for the hardness test results.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889657","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 Chromium Concentration on the Microstructure and Magnetic Properties of FeCr Nanostructured Powders Prepared by Mechanical Alloying","authors":"S. Sahih,&nbsp;M. Hemmous,&nbsp;A. Guittoum,&nbsp;D. Martínez-Blanco,&nbsp;J. A. Blanco,&nbsp;P. Gorria,&nbsp;M. Sidoumou","doi":"10.1007/s10948-024-06875-7","DOIUrl":"10.1007/s10948-024-06875-7","url":null,"abstract":"<div><p>We have successfully synthesized FeCr nanostructured powders via a high-energy ball milling process. The effect of the chromium (Cr) concentration on the structural, magnetic, and hyperfine properties of Fe_100−xCr_x (<i>x</i> = 2.5, 7.5, 12.5, 17.5, and 20 at.%) nanostructured powders were investigated. For the low Cr concentrations, the X-ray diffraction results reveal the presence of a single phase which is the centered cubic body (bcc). Beyond 12.5 at.%, the structure shows a mixture of bcc and face-centered cubic (fcc) phases. The value of the lattice parameter of the bcc-FeCr phase gradually increases as the Cr concentration increases, reaching a maximum of 2.8776 Å. With the exception of the lowest Cr concentration (2.5 at.%), we note that the mean grain size, &lt; <i>D</i>(nm) &gt; , linearly decreases down to around 57 nm when the Cr concentration is increased; the same behavior was observed for the mechanically induced microstrain, <i>ε</i> (%). The addition of Cr strongly affects the value of the saturation magnetization (<i>M</i>_S), i.e., the saturation magnetization monotonously decreases with increasing Cr concentration. However, the coercive field (<i>H</i>_C) increases up to 54 Oe as the Cr concentration is increased. The Mössbauer results confirm those obtained by XRD analysis and show a clear influence of Cr concentration on the hyperfine magnetic field &lt; <i>B</i>_hf &gt; and consequently on the local environment of iron atoms.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889727","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":"Ferromagnetism and Magnetic Anisotropy Induced in Rare-Earth (La, Ce, Pr, Nd, Pm, and Sm)-Doping 2D Sn Monolayers","authors":"A. Ait Taleb,&nbsp;H. El Hadfi,&nbsp;L. B. Drissi,&nbsp;F. Z. Ramadan","doi":"10.1007/s10948-024-06882-8","DOIUrl":"10.1007/s10948-024-06882-8","url":null,"abstract":"<div><p>This work delves into the electronic and magnetic properties of rare-earth (RE) element doping 12.50% on stanene monolayers using density functional theory (DFT) with diverse functionals (PBE, PBE+U, and HSE06). Stability was confirmed through formation energy, binding energy, and phonon dispersion calculations. The PBE+U scheme induces a transition from metallic to half-metallic behavior in the doped systems. Conversely, the HSE06 functional transforms all structures from half-metallic to semiconducting, showcasing the dramatic impact of chosen functionals on the band gap. Specific RE dopants exhibit varying ground states, with some favoring ferromagnetism (FM) and others favoring antiferromagnetism (AFM). The FM states boast Curie temperatures exceeding room temperature making them ideal candidates for spin filters in future spintronic devices. <b>Additionally, RE-doped systems exhibiting significant MAE, such as Pr, Nd, Pm, and Sm-doped, hold great potential for applications in spin transport devices and high-density magnetic storage materials. Our analysis on the formation of MA clusters in the RE-doped stanene monolayers reveals their significant influence on the exchange interactions, leading to enhanced magnetic stability and increased Curie temperatures.</b> These findings pave the way for utilizing RE-doped stanene monolayers in next-generation spintronics applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889659","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":"First-Principles Analysis of Photoelectric and Magnetic Tunability in Transition Metal-Doped Janus MSeX Monolayers (M = Mo, W; X = S, Te)","authors":"Huaidong Liu,&nbsp;Lu Yang,&nbsp;Shihang Sun,&nbsp;Yanshen Zhao,&nbsp;Xingbin Wei","doi":"10.1007/s10948-024-06868-6","DOIUrl":"10.1007/s10948-024-06868-6","url":null,"abstract":"<div><p>In this study, the modulation effect of transition metal (TM) doping on the electronic, magnetic, and optical properties of the Janus MSeX monolayers (M = Mo, W; X = S, Te) system is systematically investigated by applying the GGA + U methodology in the context of density functional theory. Phonon spectral and thermodynamic analyses confirm the dynamic stability of these systems and the differences in their thermophysical properties. The stability of the doped systems is evaluated in terms of formation and binding energies. Specific TM doping, such as V, Mn, and Fe, induces magnetic semi-metallic behavior in the MSeX system. Ta, Tc, and Re doping exhibit different magnetic and electronic properties in different systems. In addition, the doping-induced redshift of the light absorption edge and the appearance of new absorption peaks significantly enhance the material’s responsiveness to the infrared to the visible range. This study deepens the understanding of the physical properties of Janus materials and provides a theoretical basis for their potential in thermoelectric, sensing, and optoelectronic material applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889704","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":"Structural, Optical, and Magnetic Characteristics of (Zn0.5Ni0.5Fe2O4)0.5(Ba0.4Sr0.4Ca0.2Fe12O19)0.5 Nanocomposite Synthesized by the Ball-Milling Assisted Co-precipitation Route","authors":"Ahmad Najem,&nbsp;K. Habanjar,&nbsp;R. Awad,&nbsp;M. Matar","doi":"10.1007/s10948-024-06858-8","DOIUrl":"10.1007/s10948-024-06858-8","url":null,"abstract":"&lt;div&gt;&lt;p&gt;In this study, the structural, optical, and magnetic properties of the Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; soft ferrite nanoparticle, the Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt; hard ferrite nanoparticle, and their nanocomposite (Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt;(Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt; have been investigated. The nanoparticles and the nanocomposite were synthesized via co-precipitation and ball-milling routes, respectively. The formation, purity, and crystallinity of the samples were verified from the Rietveld analysis of X-ray diffraction (XRD) data as well as the essential absorption bands in the Fourier transform infrared (FTIR). The morphology and lattice spacing were investigated using transmission electron microscopy (TEM), high-resolution TEM (HRTEM), and selected area electron diffraction (SAED). TEM micrographs visualized the hexagonal morphology of Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt; phase and the spherical-like shape of Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; phase. A scanning electron microscope (SEM) revealed well-distributed grains in the composite. Furthermore, energy-dispersive X-ray analysis (EDX) analysis validated the chemical compositions and the coexistence of Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; and Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt; phases in one matrix. Additionally, the optical behavior of the samples was tested via ultraviolet–visible and photoluminescence spectroscopies. Tauc plots were used to estimate the direct energy gap using UV spectroscopy. The direct and indirect energy band gaps of (Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt;(Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt; nanocomposite are in between that of the pure phases, due to the increase in energy states with particle size. Also, near-band edge emissions and deep-level emissions have been observed in PL studies. X-ray photoelectric spectroscopy (XPS) studies were performed to investigate the elemental composition and cationic distribution. A good exchange coupling between both nanoparticles was verified via a single-phase behavior in the magnetic hysteresis loop. (Zn&lt;sub&gt;0.5&lt;/sub&gt;Ni&lt;sub&gt;0.5&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt;(Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt;)&lt;sub&gt;0.5&lt;/sub&gt; nanocomposite had a higher saturation magnetization (&lt;span&gt;({M}_{s})&lt;/span&gt;) compared to Ba&lt;sub&gt;0.4&lt;/sub&gt;Sr&lt;sub&gt;0.4&lt;/sub&gt;Ca&lt;sub&gt;0.2&lt;/sub&gt;Fe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt; phase and a squareness ratio (SQR) of 0.207 value (&lt;span&gt;(&lt;0.5),)&lt;/span&gt; making it suitable for use in magnetic hyperthermia, the production of permanent magnets, and extremely sensit","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889482","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":"Description of Resistive Transition for Type-II Superconductors","authors":"Denis Gokhfeld","doi":"10.1007/s10948-024-06894-4","DOIUrl":"10.1007/s10948-024-06894-4","url":null,"abstract":"<div><p>The Boltzmann sigmoid function effectively describes parameter changes during transitions between different states. A method using the Boltzmann function is proposed to analyze the temperature dependencies of superconductors near their critical temperature. Data for various superconductors (MgB₂, YBCO, Bi2212, a high-entropy alloy, CeH₉) are described, and parameters characterizing their resistive transition are estimated.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889608","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 Physical Properties of V-Ti-Ce Alloy Superconductors Through Successive Cold-Working and Annealing at 650 °C","authors":"Asi Khandelwal,&nbsp;Nida Mirza,&nbsp;L. S. Sharath Chandra,&nbsp;Rashmi Singh,&nbsp;Archna Sagdeo,&nbsp;M. K. Chattopadhyay","doi":"10.1007/s10948-024-06859-7","DOIUrl":"10.1007/s10948-024-06859-7","url":null,"abstract":"<div><p>V- Ti alloys are promising alternatives to Nb for the construction of superconducting solenoids that produce high magnetic fields. The critical current density (<span>(J_C)</span>), which quantifies the capacity of a superconductor to carry large dissipationless current, increases in the V-Ti alloys with the addition of Ce. Here, the effects of successive cold working and annealing on the electrical resistivity, <span>(J_C)</span>, and microstructure of the V<span>(_{0.59})</span>Ti<span>(_{0.40})</span>Ce<span>(_{0.01})</span> alloy are studied. The <span>(J_C)</span> is the maximum after the second cold rolling. Annealing at 650 <span>(^{circ })</span>C is found to nucleate and grow the <span>(alpha )</span>-phase which is detrimental to <span>(J_C)</span>, whereas the precipitation of the <span>(alpha ')</span>-phase is found to improve the <span>(J_C)</span>.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 1","pages":""},"PeriodicalIF":1.6,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-024-06859-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889705","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}