Physica C-superconductivity and Its Applications最新文献

{"title":"Negative magnetoresistance in superconducting stripes","authors":"B.Ya. Shapiro ,&nbsp;Baruch Rosenstein ,&nbsp;Guy Leshem","doi":"10.1016/j.physc.2025.1354821","DOIUrl":"10.1016/j.physc.2025.1354821","url":null,"abstract":"<div><div>For superconducting wires with small diameters quantum phase slippage is an important process which can yield a non-vanishing wire resistance down to very low temperatures. The effect of negative magnetoresistance for thin superconducting wire was considered in a simple model. One can conclude that the negative magnetoresistance in wires (narrow channels) are caused by decreasing number of the PSC due to interaction with entered and pinned inside Abrikosov vortices. With a subsequent increase in the magnetic field, the Abrikosov vortices replacing the phase slip centers making the main contribution to the magnetoresistance, which changes sign and becomes positive. The theory is in a good agreement with experiments.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"640 ","pages":"Article 1354821"},"PeriodicalIF":1.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145693126","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":"Can a superconductor charge a battery?","authors":"J.E. Hirsch","doi":"10.1016/j.physc.2025.1354823","DOIUrl":"10.1016/j.physc.2025.1354823","url":null,"abstract":"<div><div>To charge a battery it is necessary to know the difference between positive and negative charges. We argue that a superconductor described by the conventional theory of superconductivity does not know the difference between positive and negative charges, therefore it cannot charge a battery. Instead, a superconductor described by the theory of hole superconductivity can. We argue that existing experiments can be interpreted to imply that real superconductors can charge batteries, which undermines the credibility of the conventional theory. We propose a new experiment that can establish whether or not real superconductors are described by the alternative theory of hole superconductivity.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"640 ","pages":"Article 1354823"},"PeriodicalIF":1.0,"publicationDate":"2026-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788352","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":"Superconducting and pining vortex properties of mixed state in deuterated κ-(BEDT-TTF)2Cu[N(CN)2]Br organic superconductor","authors":"O. Sliman ,&nbsp;A. Tirbiyine ,&nbsp;J. Elqars ,&nbsp;A. Bourdyme ,&nbsp;M. Bellioua ,&nbsp;N. El ghazal ,&nbsp;H. Elouaddi ,&nbsp;Y. Ait Ahmed ,&nbsp;M. Id elamel ,&nbsp;F. Bouzit","doi":"10.1016/j.physc.2025.1354812","DOIUrl":"10.1016/j.physc.2025.1354812","url":null,"abstract":"<div><div>The analysis of the hysteresis loop at low and intermediate magnetic field, allows us to estimate the lower critical magnetic field H_c1 and the full penetration magnetic field H_f in deuterated κ-(ET)₂Cu[N(CN)₂]Br organic superconductors at temperature <em>T</em> = 2 K both in rapid and slow cooling of the sample, through the structural transformation that occurs near 80 K. The investigation of the hysteresis loop at intermediate magnetic fields reveals that the system does not undergo a vortex solid-to-liquid melting transition or a 3D–2D decoupling transition within the explored magnetic field range. The analysis of the pinning force at the same temperature shows that rapid cooling near 80 K dramatically reduces the pinning strength and completely alters the dominant pinning mechanism. Under slow cooling, the dominant mechanism is normal point pinning, whereas under rapid cooling it shifts to a surface pinning mechanism.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354812"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334136","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":"Heat capacity and magnetic properties of NbTiN films in the bulk limit","authors":"Elena Cimpoiasu ,&nbsp;Viorel Sandu ,&nbsp;Karwan Rostem ,&nbsp;Edward J. Wollack ,&nbsp;Ari D. Brown ,&nbsp;Kevin H. Miller ,&nbsp;Vilem Mikula","doi":"10.1016/j.physc.2025.1354813","DOIUrl":"10.1016/j.physc.2025.1354813","url":null,"abstract":"<div><div>Heat capacity and magnetic measurements were used to extract superconducting parameters for deposited NbTiN films in the bulk limit, including the critical temperature, the ratio of the superconducting gap to the critical temperature, the phase coherence length, and the upper critical field. We found that the film is a strong coupling superconductor, with a small phase coherence length, consistent with trends reported in the literature. Due to the large thickness, these materials correspond to 3D analogues of bulk NbTiN. The upper critical fields determined from heat capacity and magnetic field measurements are different, emphasizing the sensitivity of magnetic field measurements to defects. The Ginzburg number is much smaller compared to high-T_c superconductors, while magnetic relaxation measurements point towards a Kim-Anderson vortex creep regime.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354813"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145474435","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":"First-principles calculations of the stability and electronic properties of KHn under pressure","authors":"Meng Wang ,&nbsp;Zhi-Yuan Qiu ,&nbsp;Zheng-Tang Liu ,&nbsp;Juan Gao","doi":"10.1016/j.physc.2025.1354811","DOIUrl":"10.1016/j.physc.2025.1354811","url":null,"abstract":"<div><div>In this paper, based on thermodynamic and dynamic stability, the stable KH_n (<em>n</em> = 3, 5, 8, 9, 10, 11, 12) systems and their range of stable intervals were determined. The pressure range for metallization has been determined. The formation enthalpy, band structure, density of states (DOS), and phonon spectrum were further studied. It is found that both KH₃ and KH₅ can be metallized in a monoclinic crystal system containing H₃^⁻ units, which indicates that the appearance of H₃^⁻ units is conducive to their metallization. Additionally, KH₅ and KH₁₀ possess a special layered structure similar to that of solid hydrogen—this similarity highlights the significant influence of hydrogen (H) on their structural composition. Through the specific analysis of KH₅ and KH₁₀, it is found that the density of states at the Fermi level is mainly contributed by hydrogen atoms, and the electron delocalization of hydrogen sublattice is the main reason for the metallization of the compound. This study has reference significance for the metallization mechanism of alkali metal hydrides.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354811"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334261","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 diffusion of Fe from the shield into the in situ MgB2 material in superconducting wires","authors":"Daniel Gajda ,&nbsp;Michał Babij ,&nbsp;Andrzej Zaleski ,&nbsp;Dogan Avci ,&nbsp;Hakan Yetis ,&nbsp;Ibrahim Belenli ,&nbsp;Fırat Karaboga ,&nbsp;Damian Szymański ,&nbsp;Tomasz Czujko","doi":"10.1016/j.physc.2025.1354816","DOIUrl":"10.1016/j.physc.2025.1354816","url":null,"abstract":"<div><div>The findings of this study demonstrate that the morphology of in situ MgB₂ wires examined by scanning electron microscopy (SEM) is primarily influenced by the applied polishing method, rather than by intrinsic phenomena associated with the synthesis reaction. This observation is of paramount importance for all superconducting ceramic materials. Main purpose of using fractured surfaces is to significantly better characterize of the Fe₂B layer microstructure and composition. Furthermore, our paper presents the influence of the annealing temperature and initial filling densities on the diffusion of Fe from the shield into the core of the MgB₂ material. Our results show that two intermetallic layers are formed during the solid-state reaction of Mg with B and long annealing time in MgB₂ wires in an Fe shield. The first layer is composed of Mg and Fe, which do not form chemical bonds, and the subsequent layer consists of iron borides. To the best of the present author's knowledge, results of this kind pertaining to in situ MgB₂ wires within Fe shields have not hitherto been reported. Moreover, it was demonstrated that thermal treatment in the liquid state of Mg facilitates the formation of an iron boride layer between the MgB₂ core and the Fe shields. Additionally, the X-ray powder diffraction showed that the initial filling densities strongly affect the boride phases formed in Fe-shielded MgB₂ wires.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354816"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145576343","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":"Effect of periodically arranged La2Zr2O7 dots on the critical current density of Bi-2212 thin films","authors":"Jian Ju ,&nbsp;Li Lei ,&nbsp;Yan Zhang ,&nbsp;Gaoyang Zhao ,&nbsp;Minghu Shen","doi":"10.1016/j.physc.2025.1354815","DOIUrl":"10.1016/j.physc.2025.1354815","url":null,"abstract":"<div><div>Bi₂Sr₂Ca₁Cu₂O_8+δ (Bi-2212) thin films were fabricated on LaAlO₃ (LAO) substrates via the sol-gel method. La₂Zr₂O₇ (LZO) circular dot arrays (25 μm in diameter) were patterned on LAO substrates using a photosensitive sol-gel technique, followed by the deposition of LZO/Bi-2212 composite films. The superconducting properties, including resistivity-temperature (<em>R</em>-<em>T</em>), critical current density-temperature (<em>J</em>_c-<em>T</em>), and critical current density versus magnetic field (<em>J</em>_c-<em>H</em>) curves, were systematically characterized. Results indicate that the composite film exhibits a slightly reduced critical temperature (<em>T</em>_c = 79 K) compared to the monolayer Bi-2212 film (<em>T</em>_c = 81 K), yet its <em>J</em>_c is significantly enhanced. By analyzing the scaling behavior of <em>J</em>_c /(1 + <em>T</em>/<em>T</em>_c)² versus 1 - <em>T</em>/<em>T</em>_c, we propose that dislocations formed at the LZO/Bi-2212 interface act as effective flux pinning centers. This hypothesis is supported by the weakened in-plane/out-of-plane textures observed in composite films, which correlate with interfacial lattice distortions.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354815"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145526304","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":"Comprehensive analysis of pressure and oxygen doping on the structure and electronic properties of HgBa2Ca2Cu3O8 superconductor","authors":"Long Qian ,&nbsp;Wen-Guang Li ,&nbsp;Jin-Yan Li ,&nbsp;Pei-Chao Li ,&nbsp;Zheng-Tang Liu ,&nbsp;Qi-Jun Liu","doi":"10.1016/j.physc.2025.1354803","DOIUrl":"10.1016/j.physc.2025.1354803","url":null,"abstract":"<div><div>First-principles calculations were performed to investigate the electronic properties of HgBa₂Ca₂Cu₃O₈ (Hg-1223) under applied pressures ranging from 0 to 15 GPa and oxygen doping levels (<em>δ</em>) varying from 0 to 0.5. Under pressure, strengthened Cu-O bonding within the CuO₂ planes and weakened interlayer coupling result in carriers being predominantly confined to the CuO₂ layers, reflecting the inherent two-dimensional nature of the electronic structure in Hg-1223. The introduction of oxygen at the O(4) site increases the density of states (DOS) at the Fermi level and enhances interatomic interactions, leading to a significant increase in hole concentration within the CuO₂ layers. A characteristic peak was observed in the O(4) DOS near the Fermi level in doped supercells; accordingly, an optimal oxygen doping concentration, <em>δ</em>_O, was defined. Based on the computational results, we propose an optimal <em>δ</em>_O range for Hg-1223 of 0.35 &lt; <em>δ</em>_O &lt; 0.45.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354803"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248050","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":"Distinctive features of metal/superconductor-insulator transitions in doped La-based cuprates with large–radius impurities and their influence on enhancement of high-Tc superconductivity","authors":"U.T. Kurbanov ,&nbsp;S. Dzhumanov ,&nbsp;G.K. Zhumabaeva","doi":"10.1016/j.physc.2025.1354802","DOIUrl":"10.1016/j.physc.2025.1354802","url":null,"abstract":"&lt;div&gt;&lt;div&gt;We study the possibility of the localization of hole carriers and the distinctive features of the metal/ superconductor–insulator transitions in doped &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;-based cuprates with large-radius dopants (impurities) within the single–carrier cuprate superconductor model and obtain important insights in the role of large-radius impurities, strong electron–phonon interaction and polaronic (including also charge-density-wave (CDW) and pseudogap) effects in these electronic processes. We show that when the value of the high-frequency dielectric constant &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; of the cuprates changes from 5 to 2.5 and the ratio &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (where &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; is the static dielectric constant of the cuprates) decreases from 0.14 down to 0.02 the new metal/superconductor–insulator transitions in doped cuprates &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;S&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;r&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (LSCO) and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;L&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;−&lt;/mo&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;B&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;a&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;x&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mi&gt;C&lt;/mi&gt;&lt;mi&gt;u&lt;/mi&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;O&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;4&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (LBCO) are caused by the strong hole–lattice interactions and polaronic effects and occur in a wide doping range from the lightly doped to overdoped regime. We find that such metal/superconductor–insulator transitions depending on the values of &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; (e.g., for &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;≥&lt;/mo&gt;&lt;mn&gt;2&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mi&gt;η&lt;/mi&gt;&lt;mo&gt;≥&lt;/mo&gt;&lt;mn&gt;0&lt;/mn&gt;&lt;mo&gt;.&lt;/mo&gt;&lt;mn&gt;02&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) and the types of the ordering of polaronic carriers occur in these materials even in the overdoped regime (when the binding energy &lt;span&gt;&lt;math&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;p&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt; of large polarons is increased significantly from 0.05 eV (at &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;mo&gt;=&lt;/mo&gt;&lt;mn&gt;5&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;) up to 0.2 eV (at &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;msub&gt;&lt;mrow&gt;&lt;mi&gt;ɛ&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow&gt;&lt;mi&gt;∞&lt;/mi&gt;","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354802"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145334137","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":"On the dynamics of the Meissner and the Becker-London effects","authors":"Peter Markoš,&nbsp;Richard Hlubina","doi":"10.1016/j.physc.2025.1354814","DOIUrl":"10.1016/j.physc.2025.1354814","url":null,"abstract":"<div><div>It is generally accepted that the most fundamental property of a superconductor is that it exhibits the Meissner effect. Of similar importance is the Becker-London effect, i.e. generation of magnetic field inside a rotating superconductor. Hirsch has recently pointed out that, within the conventional theory of superconductivity, the question about how these effects are generated dynamically has not even been asked yet. Here we fill in this gap in the literature by a detailed study of the evolution of the electromagnetic field for both of these effects. To this end, we solve the Maxwell equations supplemented by the simplest conventional constitutive equation for a superconductor, namely the London equation. We demonstrate that, contrary to the expectations of Hirsch, the conventional theory does correctly describe the dynamics of both, the Meissner and the Becker-London effect. We find that the dynamics of the studied processes is quite rich and interesting even at this level of description.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"639 ","pages":"Article 1354814"},"PeriodicalIF":1.0,"publicationDate":"2025-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145526303","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}