Journal of Superconductivity and Novel Magnetism最新文献

{"title":"Computational Investigations of Mo2XT2 (X = C, N; T = F, O) MXenes for Optoelectronic Applications","authors":"Bakhtiar Ul Haq,&nbsp;Se-Hun Kim,&nbsp;R. Ahmed,&nbsp;Aijaz Rasool Chaudhry,&nbsp;Adnan Ali,&nbsp;Mohammed Benali Kanoun,&nbsp;Souraya Goumri-Said,&nbsp;Zulfiqar Ali Shah","doi":"10.1007/s10948-026-07174-z","DOIUrl":"10.1007/s10948-026-07174-z","url":null,"abstract":"<div>\u0000 \u0000 <p>MXenes are regarded as highly promising two-dimensional (2D) materials for next-generation device applications and are therefore extensively explored in recent years. Here, we explore MXenes based on Mo₂XT₂ (X = C, N; T = F, O) derived from Mo₂SiC MAX phase for applications in modern technologies. Through the computational approach, the physical properties of Mo₂XT₂ MXenes were explored, considering variations in X-elements and functional groups. The studied MXenes exhibited metal-like behavior where the Mo-<i>d</i> states appear over the Fermi level, a feature inherited from the MAX phases. Moreover, the electronic structures of the studied MXenes demonstrated nearly similar band arrangements for the up and down spin channels when functionalized with oxygen. In contrast, the MXenes functionalized with fluorine showed relatively asymmetrical electronic structures. The different spin-up and down electronic states have induced magnetic moments of magnitude 2.10 μ_β for Mo₂CF₂, 3.13 μ_β for Mo₂NF₂, 0.75 μ_β for Mo₂CO₂, and 1.41 μ_β for Mo₂NO₂. The refractive index values for the Mo₂XT₂ MXenes remain larger than 1 for electromagnetic light with energy levels below 6 eV. These 2D materials demonstrated interesting optical properties that might be useful in optoelectronic devices.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147737610","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":"Dynamic Study of the Environmental Impact on Gap Relaxation Time in NbTi Superconducting Wire","authors":"K. Harrabi","doi":"10.1007/s10948-026-07147-2","DOIUrl":"10.1007/s10948-026-07147-2","url":null,"abstract":"<div>\u0000 \u0000 <p>We have studied non-equilibrium states in NbTi films deposited on fused silica under different surrounding conditions using electrical current pulses. When the applied current exceeds the depairing current <span>(I_{c})</span>, a voltage response is observed after a characteristic delay time <span>(t_{d})</span>. Although the sample dimensions are much larger than the coherence length <span>(xi)</span>, the localized micro-metric region formed corresponds to a hotspot. The delay times are quantitatively described using the Time-Dependent Ginzburg–Landau (TDGL) theory of M. Tinkham, enabling the determination of filament cooling times for the same sample in both liquid helium and vacuum. We find cooling times of about <span>(tau _{d} = 6.0 pm 0.5)</span> ns in vacuum and <span>(5.3 pm 0.5)</span> ns in liquid helium. These results demonstrate that liquid helium has only a minor effect on the film cooling time, with most of the heat being transferred into the substrate via phonons. </p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147363222","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":"Crystal Symmetry Effects on Oxygen Doping Distribution, SC, and Phase Diagram in YBa2Cu3O7","authors":"Bassam M. Mustafa","doi":"10.1007/s10948-026-07136-5","DOIUrl":"10.1007/s10948-026-07136-5","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;The discovery of high-temperature superconductivity (HTSC) in La&lt;sub&gt;2 − x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;CuO&lt;sub&gt;4&lt;/sub&gt; by Müller [1] in 1986 marked a new era in the history of science. Soon, Wu et al. [2]. in 1987 discovered YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt; (YBCO), which led to great achievements in all advanced fields of science and technology. However, still no consensus on a theoretical model to describe superconductivity (SC), the phase diagram (PD), and abnormalities in YBCO and other high-Tc cuprates, including the HTSC mechanism itself. In my former paper [3] studied SC in La&lt;sub&gt;2 − x&lt;/sub&gt;Sr&lt;sub&gt;x&lt;/sub&gt;CuO&lt;sub&gt;4&lt;/sub&gt; (LBCO) using crystal symmetry effects on the distribution of Sr2 + atoms in the parent crystal, using the principles: (1) Crystal symmetry affects the distribution of Sr2 + dopants on lattice sites of the parent compound; (2) Sr2 + dopants affect lattice symmetry and SC. This gives a new vision for SC in LBCO and may be for other cuprates. For LBCO: 1-By a statistical method discovered that distances between doped LBCO crystals by O atoms equals coherence the length (CL) at the concentration of start of SC; 2- Using a model for the PD depending on distribution of (1 &amp; 2 ) Sr2 + dopants ( leads to max Tc, adding more atoms decline it )for all the lattice sites each leads to represent a new phase in PD, thus succeed in explanations of the unclear changes in the phase diagram were obtained. Here in this research, the method is extended to study HTSC of YBa&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt;.The compound YBCO is different in crystal structure and doping mechanism from LSCO, but the active element in both is the CuO layer, however the method with modifications leads to fruitful results includes:1- Determination of the correct theoretical value of the coherence length (CL) for YBCO by applying symmetry effects to find relation between the distance between doped YBCO crystals and corresponding hole concentration, for this task, two methods were designed i.e. statistical and the matrix methods, it was found ( by statistical method for YBCO, CL = 16.8 Å; by matrix method CL = 16.33 Å) these are in excellent agreement with experimental values when the hole concentration is ( 0.05), at which SC started; 2- Phase coherence will not started unless the distances between dopants is within the CL. So one of the lost fundamentals puzzles in HTSC in cuprates may be found, (may be the lost fundamental point that researchers seek )because CL is a basic concept in HTSC, linked with phase coherence which is the third and the control operation needed to start SC after charge parring and condensation ;3- This leads to understand that SC occurs in three stages: parring of charge carriers during hole doping instant, and condensation of charged pairs to low energy levels, and Phase coherence which occurs due to interaction between YBCO crystals doped with holes. 4- This leads to considering that the two ","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336726","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":"Alternative Methods for the Transformation of kπ-skyrmions in Uniaxial Nanoscale Modified Films","authors":"R. M. Vakhitov,&nbsp;G. F. Ilyasova,&nbsp;M. A. Filippov","doi":"10.1007/s10948-026-07153-4","DOIUrl":"10.1007/s10948-026-07153-4","url":null,"abstract":"<div>\u0000 \u0000 <p>The paper considers micromagnetic structures arising in a uniaxial disk-shaped ferromagnet containing columnar “potential well” type defect located at its center, within which the material parameters are altered. It was shown that in the disk (in the absence of a defect), <span>(:kpi:)</span>-skyrmions (<span>(:k=1,:2,dots:7)</span>) are alternately stabilized depending on the defect radius. It was found that in this case, the transformation of the disk’s micromagnetic structure from a state with <span>(:kpi:)</span>-skyrmions occurs through the widening of its rings and the formation of a transition region at the disk edge, in which the magnetization vector once again rotates by 180°. Taking into account the presence of the defect, skyrmion stabilization occurs according to a different scenario: the transformation of <span>(:kpi:)</span>-skyrmions into <span>(:(k+1)pi:)</span>-skyrmions in the central region of the disk, corresponding to the core. In addition, it was found that the critical disk dimensions at which these transformations occur are significantly lower than in the absence of a defect in the disk, which potentially simplifies the production of more complex skyrmions in structure.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147336314","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":"Dependence of the Band Gap in CuO monolayer on Coulomb Interactions and Magnitude of the Hopping Integrals","authors":"Ilya Makarov,&nbsp;Igor Nekrasov,&nbsp;Maxim Korshunov","doi":"10.1007/s10948-026-07148-1","DOIUrl":"10.1007/s10948-026-07148-1","url":null,"abstract":"<div>\u0000 \u0000 <p>The band structure, orbital contributions to the spectral weight of the states at the top of the valence band, and the type of band gap in a CuO monolayer are investigated for different values of the hopping integrals and the Coulomb interactions on copper, <span>(U'_d)</span>, and oxygen, <span>(U'_p)</span>. The electronic structure of quasiparticle excitations is calculated using an eight-band <i>p</i>–<i>d</i> model that includes all Cu 3<i>d</i> and O 2<i>p</i> orbitals, together with the generalized tight-binding method and the the equations of motion method for Green’s functions of Hubbard operators within the multiband Hubbard model. The energy spectrum of local states and dispersionless quasiparticle excitations is obtained. The ratio <span>({{U'_d}}/ {{U'_p}})</span> determines both the magnitude and the type of the band gap. Depending on this ratio, Mott–Hubbard (MH), charge-transfer (CT), or interorbital band gap can arise. When <span>(U'_d)</span> dominates over <span>(U'_p)</span>, the system is insulating, with a band gap opening between <i>d</i>-orbitals. A metallic state can be realized only when <span>(U'_p)</span> exceeds <span>(U'_d)</span>. The metal–insulator transition driven by increasing hopping integrals is possible only for <span>(U'_d &lt; 1.5U'_p)</span>.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147342791","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 Investigation of Superconductivity in Dy-Intercalated Bilayer Graphene Under High Pressure","authors":"Yandong Yang","doi":"10.1007/s10948-026-07151-6","DOIUrl":"10.1007/s10948-026-07151-6","url":null,"abstract":"<div>\u0000 \u0000 <p>This study investigates the superconducting properties of Dy-intercalated bilayer graphene (<span>(DyC_6)</span>) using first-principles calculations. Under an applied pressure of 2 GPa, the electronic structure and electron-phonon coupling of <span>(DyC_6)</span> are evaluated within the EPW module of Quantum ESPRESSO. The results reveal a metallic multi-band Fermi surface with several bands crossing the Fermi level, indicative of strong electron-phonon coupling. The calculated electron-phonon coupling constant is <span>(lambda )</span>= 0.929, and the superconducting critical temperature is predicted to be <span>(Tc approx )</span> 11.14 K, with a superconducting gap of 1.69 meV. Analysis of the Eliashberg spectral function shows that superconductivity arises from the synergistic contribution of low-frequency Dy-related phonon modes and high-frequency C-related modes. Despite the inherent magnetic moment of Dy, calculations indicate that its magnetism is nearly quenched in the <span>(DyC_6)</span> system due to hybridization with carbon layers, allowing BCS-type phonon-mediated superconductivity to emerge. This work predicts <span>(DyC_6)</span> as a promising graphene-based superconductor and provides a theoretical basis for integrating magnetic rare-earth elements into two-dimensional materials to engineer superconducting properties.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341490","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":"Impact of Geometry on Magnetic Hysteresis: A Monte Carlo Study of Husimi Nanostructures","authors":"Z. Fadil,&nbsp;Chaitany Jayprakash Raorane,&nbsp;R. El Fdil,&nbsp;M. Naziruddin Khan,&nbsp;Seong-Cheol Kim,&nbsp;Abdulrahman A. Alsayyari,&nbsp;P. Rosaiah,&nbsp;E. Salmani","doi":"10.1007/s10948-026-07150-7","DOIUrl":"10.1007/s10948-026-07150-7","url":null,"abstract":"<div>\u0000 \u0000 <p>This study employs Monte Carlo simulations to investigate the influence of geometry, linear and biquadratic coupling interactions and temperature on the magnetic hysteresis properties of Husimi nanostructures. By analyzing triangular, square and pentagonal Husimi geometries, we demonstrate how these factors govern coercive fields, hysteresis loop behavior and thermal stability. The findings provide valuable insights into designing nanostructures tailored for technological applications, such as magnetic storage, memory devices, and spintronic sensors, emphasizing the role of geometry and coupling interactions in optimizing magnetic performance.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341508","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":"Giant magneto-impedance of Cu-doped Co-based glass-coated amorphous microwires","authors":"Shuangyou Li,&nbsp;Jiacheng Zhang,&nbsp;Chunbo Wang,&nbsp;Xiaojie Xue,&nbsp;Zhongyuan Yang,&nbsp;Shuotong Zong,&nbsp;Yan Zhang,&nbsp;Hongxia Liu,&nbsp;Zhigang Sun","doi":"10.1007/s10948-026-07149-0","DOIUrl":"10.1007/s10948-026-07149-0","url":null,"abstract":"<div>\u0000 \u0000 <p>In this study, high-quality glass-coated amorphous microwires (Co_0.7Fe_0.05Si_0.15B_0.1)_100−xCu_x (x = 0, 1, and 2) with few impurity phases, good continuity, and uniformity were successfully prepared using an optimized high-frequency induction melt-drawing technology. This work systematically investigated the effects of the direct current (DC) annealing process on the magnetic properties and giant magnetoimpedance (GMI) effect of these microwires. It was found that Cu doping enhances the crystallization stability of the alloy to a certain extent, and an appropriate content of the Cu element can significantly enhance the GMI effect of the microwires. The nanocrystallization mechanism discussed later is inferred based on relevant literature reports.What’s more, the DC annealing not only remarkably reduces the coercivity (<i>H</i>_c) of the microwires, but also significantly improves their saturation magnetization (<i>M</i>_s) and GMI effect. After DC annealing with 25 mA current, the <i>H</i>_c of (Co_0.7Fe_0.05Si_0.15B_0.1)₉₈Cu₂ microwires decreased from 3.2 A/m to 1.69 A/m, and the <i>M</i>_<i>s</i> increased from 50.49 emu/g to 73.03 emu/g. Meanwhile, by optimizing Cu content and DC annealing parameters, this work demonstrates a highly effective route to achieving a GMI ratio of 687% in Co-based microwires, offering a practical processing strategy for advanced GMI sensor materials.</p>\u0000 </div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147341509","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":"FL* Approach to Self-Energy in Cuprates: Marginal FL* Behaviour in Holes and Hourglass in the Spectral Weight of Magnons","authors":"P. A. Marchetti","doi":"10.1007/s10948-026-07142-7","DOIUrl":"10.1007/s10948-026-07142-7","url":null,"abstract":"<div><p>We apply to underdoped cuprates our FL* (fractionalized Fermi Liquid) formalism, where in addition to the standard holes other quasi-particle excitations are (semionic) holons that only carry charge and gapped spinons that only carry spin, interacting via a slave-particle gauge field. We first apply this approach to the “pseudogap phase” and we show that the slave-particle gauge interaction binds the holon and the spinon into a hole resonance whose spectral weight is essentially concentrated on Fermi arcs. Furthermore the self-energy of the hole exhibits what we call a Marginal FL* behaviour, i.e. the relaxation rate of the hole at zero temperature and small energy is proportional to the absolute value of the energy, measured from the Fermi surface. Along the nodal direction such behaviour combined with an additional Fermi liquid contribution is shown to be in agreement with many experimental data. We then apply the FL* formalism in the superconducting region of the doping-temperature phase diagram below the \"pseudogap phase\". There we show the appearance of a magnetic excitation, that we call magnon, as a spinon-antispinon resonance whose spectral weight exhibits a hourglass structure, qualitatively in agreement with neutron experiments. This structure appears as a consequence of a finite density of RVB spinon pairs and the slave-particle gauge attraction between unpaired spinons and antispinons.</p></div>","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-026-07142-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340418","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":"Correction: Investigation of Gamma-Induced Changes To Screening Currents and AC Losses in Mono- Versus Multi-filamentary REBCO Coated Conductors Using DC and AC Magnetometry","authors":"Holly Jane Campbell,&nbsp;Hirokazu Sasaki,&nbsp;Yifei Zhang","doi":"10.1007/s10948-026-07135-6","DOIUrl":"10.1007/s10948-026-07135-6","url":null,"abstract":"","PeriodicalId":669,"journal":{"name":"Journal of Superconductivity and Novel Magnetism","volume":"39 2","pages":""},"PeriodicalIF":1.7,"publicationDate":"2026-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10948-026-07135-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147340421","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}