Physica C-superconductivity and Its Applications最新文献

{"title":"Development of a 1 kW-class fully high-temperature superconducting induction/synchronous machine that enables non-superconducting operation","authors":"Yunfei Gao ,&nbsp;Taketsune Nakamura ,&nbsp;Miyuki Nakamura ,&nbsp;Takanobu Kiss","doi":"10.1016/j.physc.2024.1354634","DOIUrl":"10.1016/j.physc.2024.1354634","url":null,"abstract":"<div><div>Fully high-temperature superconducting (HTS) rotating machines, with all windings made of high-temperature superconducting materials, have garnered significant interest due to their potential for achieving extremely high efficiency and power density. However, temperature increases caused by accidents can lead to sudden release of high-density current, risking burnout of the machine. This study presents the design, fabrication, and testing of a 1 kW-class fully HTS induction/synchronous machine (HTS-ISM) capable of operating in both superconducting and non-superconducting states. The rotor features a BSCCO/normal conductor hybrid squirrel-cage winding, while the stator uses a face-to-face double-stacked (FFDS) REBCO conductor for its three-phase winding. The 12 stator FFDS coils, with a minimum bending diameter of 17 mm, achieved a average critical current of 132 A when immersed in liquid nitrogen (77 K) and demonstrated a current-carrying capacity of at least 10 A at room temperature. Rotation tests were successfully conducted at temperatures 77 K and above 120 K, confirming superconducting and normal conducting operations. These results demonstrate the feasibility of a fully HTS-ISM capable of reduced-power operation even during cooling system failure, which is crucial for applications in electric aircraft.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354634"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Exploring superconducting signatures in high-pressure hydride compounds: An electronic-structure analysis","authors":"C. Mohammed Krarroubi ,&nbsp;N. Benayad ,&nbsp;F. Benosman ,&nbsp;M. Djermouni ,&nbsp;S. Kacimi ,&nbsp;A. Zaoui","doi":"10.1016/j.physc.2024.1354628","DOIUrl":"10.1016/j.physc.2024.1354628","url":null,"abstract":"<div><div>Employing density functional theory, we investigated the band structure dispersion and density of states (DOS) of hydrogen clathrate materials <em>A</em>H₁₀ (where A=Sc, Y, Lu, Ce, Ac, Th, and Lr). These compounds were compared to the synthesized LaH₁₀ superconductor. A comparative model was utilized to extract predictive parameters as a fingerprint of superconductivity for probable <span><math><mrow><mi>f</mi><mi>c</mi><mi>c</mi></mrow></math></span>-hydrides. The band structure of LaH₁₀ was examined under high pressure, focusing on energy gap variations at specific Brillouin zone points, new parameters derived from band structure data at these points were suggested: <span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mstyle><mi>Γ</mi></mstyle></msub><mo>,</mo><mrow><mspace></mspace><mstyle><mi>Δ</mi></mstyle></mrow><msub><mi>E</mi><mi>K</mi></msub></mrow></math></span> and <span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mi>Z</mi></msub></mrow></math></span>. Additionally, two other parameters derived from DOS were proposed: the elemental contribution to the total DOS (<em>N</em>(<em>E</em>_F) in percentage) and the energetic shift of the van Hove singularity peak in the total DOS (<span><math><mrow><mstyle><mi>Δ</mi></mstyle><msub><mi>E</mi><mtext>vHs</mtext></msub></mrow></math></span>). Correlations between these parameters and the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> material's stability and superconducting properties were explored. YH₁₀, AcH₁₀, and ScH₁₀ (hypothetically stable in the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> structure) exhibited trends similar to LaH₁₀. Conversely, LrH₁₀ displayed a distinct trend, suggesting a potential increase in critical temperature at pressures exceeding 300 GPa. Based on this study, AcH₁₀ and LrH₁₀ were identified as the compounds most closely resembling LaH₁₀ and YH₁₀. However, AcH₁₀ may require extremely high pressures (above 350 GPa) to stabilize in the <span><math><mrow><mi>F</mi><mi>m</mi><mover><mn>3</mn><mo>¯</mo></mover><mi>m</mi></mrow></math></span> structure.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354628"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 design and analysis of 7 T active-shield animal MRI magnet system","authors":"Zijie Lin ,&nbsp;Chao Zhou ,&nbsp;Jiaxin Li ,&nbsp;Zhenyu Chu ,&nbsp;Panfeng Zhang ,&nbsp;Leping Wu ,&nbsp;Zhaoyao Gao ,&nbsp;Yongsuo Liu ,&nbsp;Zhan Zhang ,&nbsp;Guolin Ma ,&nbsp;Manxi Xu ,&nbsp;Kuan Lv","doi":"10.1016/j.physc.2024.1354630","DOIUrl":"10.1016/j.physc.2024.1354630","url":null,"abstract":"<div><div>Ultra-high field(≥7 T) magnetic resonance imaging(MRI) systems are expected to provide high-resolution spectrum imaging, multi-nuclide imaging, and structural photos at scales close to neuronal and neural loop levels. Advancements in Ultra-high field MRI for human use necessitate research progress in animal MRI. This work focuses on the design and analysis of superconducting magnets and cryostat for 7 T animal superconducting magnetic resonance imaging systems. Factors considered include electromagnetic stress, safety margins, and uniformity. A detailed analysis and evaluation of the scheme's feasibility are carried out.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"628 ","pages":"Article 1354630"},"PeriodicalIF":1.3,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143135440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Synergistic strategies for enhancing flux pinning in YBa2Cu3O7-x thin films at high fields and low temperature","authors":"Francesco Rizzo ,&nbsp;Laura Piperno ,&nbsp;Andrea Augieri ,&nbsp;Alexander Meledin ,&nbsp;John Feighan ,&nbsp;Judith L. MacManus-Driscoll ,&nbsp;Giuseppe Celentano","doi":"10.1016/j.physc.2025.1354648","DOIUrl":"10.1016/j.physc.2025.1354648","url":null,"abstract":"<div><div>An unexplored approach for the improvement of the flux pinning of YBa₂Cu₃O_7-x(YBCO) superconducting films grown by pulsed laser deposition (PLD) on SrTiO₃ single-crystals is presented. Hence, substrate-decorated ZrO₂ nanoislands combined with Ba₂Y(Nb/Ta)O₆ nanocolumns were engineered into YBCO films. The nanoislands produced a high density of pinning centres. In this synergistic combined pinning scenario, an absence of a temperature scaling pinning force, <em>F</em>_p(<em>H</em>) behaviour was observed, confirming several pinning mechanisms are active in the system. Thus, the high density of stacking faults and BYTO nanocolumns were both shown to be effective for high field pinning at &lt;50K. Further optimisation of the densities and volumes of each pinning type is expected to produce enhanced high field (&gt;9 T) pinning behaviour.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354648"},"PeriodicalIF":1.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143163786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}

{"title":"Evaluation of the structural, morphological, and magnetic properties of the RE-358, RE-123, RE-Ca0.1 with RE = Gd and Sm superconductors","authors":"C.C. Canaria Camargo ,&nbsp;I.M. Saavedra Gaona ,&nbsp;D.A. Landinez Tellez ,&nbsp;C.A. Parra Vargas","doi":"10.1016/j.physc.2025.1354647","DOIUrl":"10.1016/j.physc.2025.1354647","url":null,"abstract":"<div><div>In this work, we report the production of the cuprate-type <em>RE</em>₃Ba₅Cu₈O_18-δ (<em>RE-</em>358), REBa₂Cu₃O_7-δ (<em>RE-</em>123), and <em>RE</em>Ba_1.9Ca_0.1Cu₃O_7-δ (<em>RE</em>-Ca0.1), with (<em>RE</em> = Sm and Gd) superconductors. The materials were synthesized using the solid-state reaction method, with sintering temperatures ranging from 850 to 890°C. A comparative analysis of the three systems and the influence of the substituent cation on their structural, morphological, and magnetic properties was carried out through characterization techniques such as XRD, SEM, and VSM. For the <em>RE</em>-358 system, a predominant orthorhombic phase (space group <em>Pmm2</em> (25)) was identified, whereas the <em>RE</em>-123 and <em>RE</em>-Ca0.1 systems exhibited an orthorhombic structure (space group <em>Pmmm</em> (47)). SEM results revealed homogeneous and relatively smooth surfaces, attributed to the solid-state sintering reactions at high temperatures. Using vibrating sample magnetometry, magnetization curves were obtained as a function of temperature in Zero Field Cooled/Field Cooled (ZFC/FC) mode. From these measurements, the critical temperature (<span><math><msub><mi>T</mi><mi>c</mi></msub></math></span>) and irreversibility temperature (<span><math><msub><mi>T</mi><mrow><mi>i</mi><mi>r</mi><mi>r</mi></mrow></msub></math></span>) values were determined. Magnetic studies reveal that the samples exhibit a superconducting transition within the temperature range of 65 - 86 K, depending on the rare earth (<em>RE</em>) element and the system. Thermodynamic fluctuations in magnetic measurements were analyzed using the Bulavskii, Ledvij and Kogan (BKL) model that analyzes fluctuations from the Lawrence-Doniach (LD) model, with this model the parameters of penetration depth <span><math><msub><mi>λ</mi><mrow><mi>a</mi><mi>b</mi></mrow></msub></math></span>, coherence lengths <span><math><msub><mi>ξ</mi><mrow><mi>a</mi><mi>b</mi></mrow></msub></math></span>, and <span><math><msub><mi>ξ</mi><mi>c</mi></msub></math></span>, corresponding to the <em>ab</em> planes and the <em>c</em> direction, respectively, were obtained.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"630 ","pages":"Article 1354647"},"PeriodicalIF":1.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143225997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 determination of the superconductivity mechanism of the ternary metal phosphide WRuP","authors":"I. Al-Chalabi,&nbsp;S. Bağcı,&nbsp;H.Y. Uzunok,&nbsp;E. Karaca,&nbsp;H.M. Tütüncü","doi":"10.1016/j.physc.2024.1354645","DOIUrl":"10.1016/j.physc.2024.1354645","url":null,"abstract":"<div><div>The properties of orthorhombic WRuP were thoroughly analyzed using the generalized gradient approximation of density functional theory and the plane-wave pseudopotential method. Our findings indicate that the structural, electronic, elastic, and mechanical properties of WRuP are in good agreement with experimental data, suggesting that this superconductor is both mechanically stable and ductile with strong metallic bonding. The band structure analysis reveals that WRuP behaves metallically, with the density of states primarily contributed by the d states of the transition metal atoms. Furthermore, the phonon band structure analysis demonstrates that WRuP is dynamically stable, with no imaginary phonon frequencies, and the estimated electron-phonon coupling constant (λ) is 0.69. According to our calculations using the Allen–Dynes formula, the superconducting transition temperature of WRuP is estimated to be 5.74 K, consistent with the experimental value of 5.5 K. These results collectively show that WRuP is a conventional phonon-mediated superconductor with strong electron-phonon coupling.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354645"},"PeriodicalIF":1.3,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Simulation and analysis of a superconducting switch based on Josephson array","authors":"Hai Wang ,&nbsp;Jiajun Chen ,&nbsp;Yifan Wu ,&nbsp;Wenqi Wu ,&nbsp;Zhidan Zhang ,&nbsp;Xiangyan Kong","doi":"10.1016/j.physc.2024.1354644","DOIUrl":"10.1016/j.physc.2024.1354644","url":null,"abstract":"<div><div>Superconducting transition edge sensors (TES) have been applied to a variety of astronomical detection systems. To improve their detection efficiency, superconducting switches are essential components in time-division multiplexing systems. However, flux-actuated superconducting switches have such problems as large area, high noise, and complex operation. This paper proposes a structure of non-hysteresis Josephson junction array with RL transmission unit to realize a superconducting switch. Firstly, based on the current equation of the Josephson junction, a PSPICE model of a superconducting switch was established. Then, the optimization design of a single junction switch transmitting a 100 MHz signal was analyzed. Finally, we analyzed how to suppress high-frequency noise when transmitting signals above 1 GHz. Since the signal of the Josephson junction array switch is directly read out by the SQUID, it has the advantage of reducing the switch area and operation complexity.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354644"},"PeriodicalIF":1.3,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Rapid vortex flux motion in GdBa2Cu3O7−d nanobridges","authors":"L.E. Díaz ,&nbsp;N. Haberkorn","doi":"10.1016/j.physc.2025.1354649","DOIUrl":"10.1016/j.physc.2025.1354649","url":null,"abstract":"<div><div>We report on the vortex dynamics of a GdBa₂Cu₃O_7−δ nanobridge through current-voltage measurements. The study is conducted on a sample with a length of 10 μm, a width of 0.62 μm, and a thickness of 80 nm, which was grown by sputtering and fabricated using a two-step process: first, optical lithography, followed by focused ion beam milling. The results show that the film exhibits a low critical current density but demonstrates high vortex flux motion. From the Larkin–Ovchinnikov instability, we extract velocities exceeding 10 km/s at low temperatures and fields around 0.4 T (with nearly 10 vortices crossing the bridge width) and approximately 3 km/s for fields around 5 T. These results are compared with recent publications reporting high vortex velocities.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354649"},"PeriodicalIF":1.3,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143182558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Minimal surfaces & the intermediate state of type-I superconductors","authors":"Pavol Valko ,&nbsp;Thomas A. Girard","doi":"10.1016/j.physc.2024.1354641","DOIUrl":"10.1016/j.physc.2024.1354641","url":null,"abstract":"<div><div>The geometry of the intermediate state (IS) flux structures in type-I superconductors, observed during early stages of magnetic flux penetration induced by an externally applied perpendicular magnetic field, is analysed using the concept of minimal surfaces. This approach is based on the assumption that local free energy minimization, for each individual flux structure, dominates when the magnetic flux regions are sufficiently spatially separated; that is, when the global free energy minimization predicts very low periodicity in the intermediate state of the sample.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354641"},"PeriodicalIF":1.3,"publicationDate":"2024-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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":"Synthesis and characterization of YBCO superconducting thin films doped with BaHfO3 via the TFA-MOD technique for potential aerospace applications","authors":"Murat Bektas ,&nbsp;Isil Birlik ,&nbsp;Erdal Celik","doi":"10.1016/j.physc.2024.1354633","DOIUrl":"10.1016/j.physc.2024.1354633","url":null,"abstract":"<div><div>The study aims to improve the critical current density (<em>J_c</em>) and flux pinning of YBa₂Cu₃O_7-δ (YBCO) high-temperature superconducting films. The decline in <em>J_c</em> at high temperatures and magnetic fields is due to intrinsic crystalline anisotropy, thermal fluctuations, and lack of effective pinning centers. To tackle this, the study uses a novel approach by incorporating BaHfO₃ (BHO) nanostructures (dots, rods, or particles) as artificial pinning centers in YBCO films. The objective is to augment critical current density and enhance flux pinning properties using trifluoroacetates metal organic deposition method (TFA-MOD) on SrTiO₃ (STO) substrates, with a specific focus on applications in the aerospace industry. Characterization of YBCO solutions involves measuring contact angle, viscosity, and modulus. Thermal, structural, microstructural and superconducting properties of the films were scrutinized by Differential Thermal Analysis-Thermogravimetry (DTA-TG), Fourier Transform Infrared (FTIR), X-ray diffractometry (XRD), X-Ray Photoelectron Spectroscopy (XPS), Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) and Atomic Force Microscopy (AFM), Surface Profilometer (SP) and Physical Property Measurement System (PPMS). Rheological tests show viscosity decreases with temperature before stabilizing. Undoped YBCO exhibits good wetting on STO substrates. Heat treatment involves organic solvent removal and TFA decomposition, with FTIR and XRD analyses confirming decomposition of acetate complexes and strong c-axis texture. XPS results indicate consistent chemical compositions, while surface morphologies are flat and crack-free, with denser structures in BHO-doped films. Doping improves superconductivity up to a certain concentration, after which it decreases. Average film thickness is around 240 nm. Undoped YBCO films exhibit poor superconducting properties due to secondary phases, while BHO doping influences superconductivity, with an increase in critical current density up to a certain concentration, beyond which superconductivity is lost.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"629 ","pages":"Article 1354633"},"PeriodicalIF":1.3,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143183619","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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}