Journal of Superconductivity and Novel Magnetism最新文献

{"title":"On the Superconducting Critical Temperature of La(_{2-x})Sr(_{x})CuO(_{4})/Sm(_{2})CuO(_4) Superlattice: Polaronic Point of View of Stacking Periodicity Dependence","authors":"B. Ya. Yavidov,&nbsp;S. M. Otajonov,&nbsp;D. E. Uskenbaev,&nbsp;O. K. Ganiev,&nbsp;A. S. Jalekeshov,&nbsp;T. Saparbaev","doi":"10.1007/s10948-025-06978-9","DOIUrl":"10.1007/s10948-025-06978-9","url":null,"abstract":"<div><p>This paper investigates the superconductivity of La<span>(_{2-x})</span>Sr<span>(_{x})</span>CuO<span>(_{4})</span>/Sm<span>(_{2})</span>CuO<span>(_4)</span> superlattices using a theoretical approach based on the extended Holstein model and bipolaronic mechanism for high-temperature superconductivity. We analyzed the dependence of the superconducting critical temperature (<span>(T_c)</span>) on the thickness of the La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> layer (<span>(d_f)</span>) within the superlattice, which can also be expressed as the number of La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> half-unit cells (<span>(N_{stc.p})</span>). Our model assumes that the charge carriers in superconducting La<span>(_{1.85})</span>Sr<span>(_{0.15})</span>CuO<span>(_4)</span> layers are bipolarons. We associate high-temperature superconductivity with the superfluidity of the liquid of intersite bipolarons and estimate the superfluidity transition temperature as the Bose-Einstein condensation temperature (<span>(T_{BEC})</span>) of the gas (liquid) of intersite bipolarons. In this way, we directly link the superlattice’s <span>(T_c)</span> with the corresponding Bose-Einstein condensation temperature (<span>(T_{BEC})</span>). Numerical calculations revealed a strong correlation between <span>(T_c)</span> and <span>(T_{BEC})</span>. Importantly, these calculations accurately reproduce the experimental trend of <span>(T_c)</span> with respect to <span>(d_f)</span> or <span>(N_{stc.p})</span>. Our results strongly suggest that strain-induced polaronic effects play a critical role in the superconductivity of La<span>(_{2-x})</span>Sr<span>(_{x})</span>CuO<span>(_{4})</span>/Sm<span>(_{2})</span>CuO<span>(_4)</span> superlattices, further supporting the validity of the bipolaronic model for high-temperature superconductivity in cuprates.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143871298","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":"Toward the Detection of Spin-Vortex-Induced Loop Currents in a Single Bilayer Bi(_2)Sr(_2)CaCu(_2)O(_{8+delta }) Thin Film and Their Possible Use as Qubits: Model Calculations for Three Nano-island Architecture","authors":"Hayato Taya,&nbsp;Yuto Takatsu,&nbsp;Hiroyasu Koizumi","doi":"10.1007/s10948-025-06960-5","DOIUrl":"10.1007/s10948-025-06960-5","url":null,"abstract":"<div><p>A theory for cuprate superconductivity predicts the existence of nano-sized loop currents called “spin-vortex-induced loop currents (SVILCs).” In this work, we first calculate magnetic fields produced by them in a single bilayer Bi<span>(_2)</span>Sr<span>(_2)</span>CaCu<span>(_2)</span>O<span>(_{8+delta })</span> (Bi-2212) thin film for the purpose of detecting the SVILCs. The estimated magnitude of the magnetic field at the point 10<i>a</i> (<i>a</i> is the lattice constant of the CuO<span>(_2)</span> plane) above the surface could be in the order of 100 mT; thus, they may be detectable by currently available detection methods. Next, we investigate the use of them as qubits (the “SVILC qubits”) in an architecture composed of three nano-islands of the thin film and consider the use of the detection of the magnetic field generated by the SVILCs as the qubit readout. We show there are a number of energy levels suitable for qubit states that can be manipulated by external current feeding, and the magnetic field generated by the SVILCs is large enough to be used for the readout.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 3","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06960-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143861352","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}

{"title":"Implementation and Readout of Maximally Entangled Two-Qubit Gates Quantum Circuits in a Superconducting Quantum Processor","authors":"V. Stasino,&nbsp;P. Mastrovito,&nbsp;C. Cosenza,&nbsp;A. Levochkina,&nbsp;M. Esposito,&nbsp;D. Montemurro,&nbsp;G. P. Pepe,&nbsp;A. Bruno,&nbsp;F. Tafuri,&nbsp;D. Massarotti,&nbsp;H. G. Ahmad","doi":"10.1007/s10948-025-06968-x","DOIUrl":"10.1007/s10948-025-06968-x","url":null,"abstract":"<div><p>Besides noticeable challenges in implementing low-error single- and two-qubit quantum gates in superconducting quantum processors, the readout technique and analysis are a key factor in determining the efficiency and performance of quantum processors. Being able to efficiently implement quantum algorithms involving entangling gates and asses their output is mandatory for quantum utility. In a transmon-based 5-qubit superconducting quantum processor, we compared the performance of quantum circuits involving an increasing level of complexity, from single-qubit circuits to maximally entangled Bell circuits. This comparison highlighted the importance of the readout analysis and helped us optimize the protocol for more advanced quantum algorithms. Here, we report the results obtained from the analysis of the outputs of quantum circuits using two readout paradigms, referred to as “multiplied readout probabilities” and “conditional readout probabilities.” The first method is suitable for single-qubit circuits, while the second is essential for accurately interpreting the outputs of circuits involving two-qubit gates.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06968-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143830688","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}

{"title":"Exploring the Effect of La Substitution on Magnetic and Electrical Behavior of DyFeO3","authors":"S. Shravan Kumar Reddy,&nbsp;S. Shanmukharao Samatham,&nbsp;T. Sowmyya,&nbsp;M. Sreenath Reddy,&nbsp;G. R. Turpu,&nbsp;Ch. Gopal Reddy,&nbsp;P. Yadagiri Reddy,&nbsp;V. Raghavendra Reddy","doi":"10.1007/s10948-025-06967-y","DOIUrl":"10.1007/s10948-025-06967-y","url":null,"abstract":"<div><p>Structural, electrical, magnetic, and ⁵⁷Fe Mössbauer studies on lanthanum (La)-doped DyFeO₃ (Dy_1-xLa_xFeO₃) are reported in this paper. X-ray diffraction measurements confirm the lattice expansion with La doping. Raman spectroscopic studies give insights into the doping of La into Dy in DyFeO₃. The temperature-dependent magnetization studies of samples show that there is a shift in the spin-reorientation transition temperature (<i>T</i>_SR) towards the lower temperatures with the increase of La-doping concentration for pure DyFeO₃ (DFO), Dy_0.8La_0.2FeO₃ (La2), and Dy_0.6La_0.4FeO₃ (La4) samples which could be due to the weakening of Fe³⁺-Dy³⁺ exchange interaction. Isothermal magnetization data and magnetically split sextet ⁵⁷Fe Mossbauer spectra of all the samples confirm the presence of antiferromagnetic ordering at room temperature. In addition, the observed magnetization data of LaFeO₃ (<i>x</i> = 1.0) sample indicates the presence of spin-glasslike behavior. It is also observed that with the increase of La doping, porosity increases resulting in the enhancement of leakage current density. Ohmic and space charge limited conduction (SCLC) mechanisms explain the conduction mechanism present in the samples.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835540","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":"Hydride Superconductivity: Here to Stay, or to Lead Astray and Some Day Go Away?","authors":"J. E. Hirsch","doi":"10.1007/s10948-025-06972-1","DOIUrl":"10.1007/s10948-025-06972-1","url":null,"abstract":"<div><p>In a recent paper (Boebinger et al. Nat. Rev. Phys. <b>7</b>, 2 2025; 2024), fifteen prominent leaders in the field of condensed matter physics declare that hydride superconductivity is real, and urge funding agencies to continue to support the field. I question the validity and constructiveness of their argument.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06972-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835541","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}

{"title":"Observations of the Novel Low-Field Microwave Absorption in ZnxCo1-xFe2-xAlxO4 Ferrites","authors":"S. J. C. Masuku,&nbsp;J. Z. Msomi,&nbsp;T. S. Mahule,&nbsp;V. V. Srinivasu","doi":"10.1007/s10948-025-06954-3","DOIUrl":"10.1007/s10948-025-06954-3","url":null,"abstract":"<div><p>Nanocrystalline Zn_<i>x</i>Co_1-<i>x</i>Fe_2-<i>x</i>Al_<i>x</i>O₄ with particle sizes between 6 and 13 nm were synthesized by glycol-thermal reaction under a low reaction temperature of 200 °C. XRD analysis confirmed the cubic spinel phase with no impurity phases of the as prepared compounds. Raman active photon modes observed also confirmed ferrite crystal lattice. Direct TEM measurements of particle sizes relate well with XRD data and reveal nearly spherical-shaped particle images. Electron spin resonance analysis shows the novel low-field microwave absorptions (LFMA) for the as-prepared (6 ≤ <i>D</i> ≤ 13 nm) compounds recorded at about zero fields. Similar signals have been observed for similar compounds produced by standard ceramic process, confirming reproducibility. The area of the LFMA signals increases with increasing Zn²⁺ and Al³⁺ concentrations and their orientations change with particle size. The presence of LFMA signals makes compounds investigated suitable for applications in low magnetic field sensors, magnetic field-controlled absorbers, spin valves, etc.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06954-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821921","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}

{"title":"Computational Insights into the Magnetocaloric Effect and Magnetic Properties of Gd(_3)In Compound for Magnetic Refrigeration Applications","authors":"H. Kerrai,&nbsp;E. M. Jalal,&nbsp;H. Saadi,&nbsp;M. Salama,&nbsp;M. Kerouad,&nbsp;A. Zaim","doi":"10.1007/s10948-025-06970-3","DOIUrl":"10.1007/s10948-025-06970-3","url":null,"abstract":"<div><p>This manuscript investigates the magnetocaloric effect and magnetic properties of the Gd<span>(_3)</span>In compound as functions of magnetic field and temperature using a mean-field approximation. We first introduce the model and methodology, followed by the determination of the transition temperature through the analysis of magnetization, susceptibility, and magnetic entropy change (<span>(-Delta S_m)</span>). Our temperature-dependent magnetization analysis reveals a second-order phase transition from the ferromagnetic (FM) to the paramagnetic (PM) phase at 208 K, consistent with previous theoretical and experimental findings. The maximum magnetic entropy change (<span>(-Delta S_m^{text {max}})</span>) is 6.46 J/kg.K at 208 K under a 5 T magnetic field, with a corresponding relative cooling power (RCP) of 680.11 J/kg. Additionally, hysteresis behavior is observed at various temperatures. These findings suggest that Gd<span>(_3)</span>In is a promising candidate for magnetic refrigeration applications.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809356","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":"Correction: Effect of Barium Hexaferrites and Thermally Reduced Graphene Oxide on EMI Shielding Properties in Polymer Composites","authors":"Khadija Zubair,&nbsp;M. Fayzan Shakir,&nbsp;Ayesha Afzal,&nbsp;Z. A. Rehan,&nbsp;Yasir Nawab","doi":"10.1007/s10948-025-06965-0","DOIUrl":"10.1007/s10948-025-06965-0","url":null,"abstract":"","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818107","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 Perovskites MSnO3 (M = Mg, Ca): Ab Initio Investigation of Structural, Electronic, Thermodynamic, and Thermoelectric Characteristics","authors":"Y. El-harrar,&nbsp;R. Masrour,&nbsp;M. Hamedoun,&nbsp;J. Kharbach,&nbsp;A. Rezzouk,&nbsp;N. Benzakour,&nbsp;K. Bouslykhane","doi":"10.1007/s10948-025-06959-y","DOIUrl":"10.1007/s10948-025-06959-y","url":null,"abstract":"<div><p>This paper introduces an ab initio theoretical investigation employing the Full-Potential Linear Augmented Plane Wave (FP-LAPW) method grounded in Density Functional Theory (DFT). The aim is to ascertain the structural and electronic characteristics of the perovskite compounds MgSnO₃ and CaSnO₃. The calculation of structural and electronic properties involved employing the Generalized Gradient Approximation (GGA) for exchange–correlation energy. Through the minimization of energy with respect to volume using the Murnaghan equation of state, the study derived the equilibrium lattice parameter and cohesive properties of the compound. The analysis of the electronic structure was centered on examining the electronic density of states (DOS). Density Functional Theory (DFT) was employed to calculate the pressure and temperature-dependent variations in specific heat, entropy, and Debye temperature. The equation of state, implemented through the GIBBS program based on the quasi-harmonic Debye model, facilitated these computations. Notably, a specific heat behavior of Cv≈Cp was identified at temperatures below <i>T</i> = 300 K, surpassing Dulong-Petit limit values reported for simple perovskites. Furthermore, thermoelectric properties were assessed using the Boltzmann transport theory in the BoltzTraP code.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809342","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":"Long-Range Superconducting Transition Limited by Phase Slip or Vortex Glass Phase in SmFe1-xCoxAsO Polycrystalline Thin Films","authors":"K. Aguilar-Mendoza,&nbsp;A. Guillen-Cervantes,&nbsp;I. Corrales-Mendoza,&nbsp;A. Conde-Gallardo","doi":"10.1007/s10948-025-06949-0","DOIUrl":"10.1007/s10948-025-06949-0","url":null,"abstract":"<div><p>The resistive transition, under an external magnetic field, was measured for two SmFe_1-xCo_xAsO superconducting films with different quality of intergranular coupling. It is observed that the sample with a low density of intergranular coupling has a semiconducting character and the transition to the long-range superconducting state is controlled by the thermal activated phase slip of the order parameter, described by the Ambegaokar-Halperin model. While in the sample with an intergranular coupling characterized by metallic connectivity, it is the freezing of the vortex lines into a vortex glass phase that controls the transition to the long-range superconducting state. A true superconducting state is observed only in the sample that shows a vortex glass phase. In contrast, in the sample in which the resistivity in the normal state indicates a semiconducting granular coupling, a broad transition that does not reach the zero-resistance state occurs. In fact, in this last sample at high applied fields, the long-range superconducting state is not reached because the intergranular coupling is broken, and the resistive signal associated with the thermal activated flux creep of the bulk vortices becomes dominant.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"38 2","pages":""},"PeriodicalIF":1.6,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-025-06949-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786654","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}