Physica C-superconductivity and Its Applications最新文献

{"title":"Spin-triplet f-wave pairing via cyclic exchange in the anisotropic triangular Hubbard model: A route to unconventional superconductivity","authors":"S. Nishimoto ,&nbsp;Y. Ohta","doi":"10.1016/j.physc.2025.1354742","DOIUrl":"10.1016/j.physc.2025.1354742","url":null,"abstract":"<div><div>We investigate the interplay between ferromagnetism and unconventional superconductivity in a two-dimensional anisotropic triangular-lattice Hubbard model using the density-matrix renormalization group (DMRG) method. A novel mechanism for spin-triplet <em>f</em>-wave superconductivity is identified, driven by three-site cyclic-exchange interactions. This mechanism highlights the crucial role of lattice anisotropy and triangular hopping networks in stabilizing ferromagnetic correlations necessary for spin-triplet pairing. The slow decay of pair-correlation functions and their sign change under a <span><math><mrow><mi>π</mi><mo>/</mo><mn>3</mn></mrow></math></span> rotation confirm the dominant <em>f</em>-wave symmetry of the superconducting state. These findings offer a unified theoretical framework for understanding unconventional superconductivity in strongly correlated electron systems, with potential relevance to materials such as Bechgaard salts <span><math><mrow><msub><mrow><mrow><mo>(</mo><mtext>TMTSF</mtext><mo>)</mo></mrow></mrow><mrow><mn>2</mn></mrow></msub><mtext>X</mtext></mrow></math></span>, cobalt oxide <span><math><mrow><msub><mrow><mtext>Na</mtext></mrow><mrow><mn>0</mn><mo>.</mo><mn>35</mn></mrow></msub><msub><mrow><mtext>CoO</mtext></mrow><mrow><mn>2</mn></mrow></msub><mi>⋅</mi><mn>1</mn><mo>.</mo><mn>3</mn><msub><mrow><mtext>H</mtext></mrow><mrow><mn>2</mn></mrow></msub><mtext>O</mtext></mrow></math></span>, and layered perovskite <span><math><mrow><msub><mrow><mtext>Sr</mtext></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mtext>RuO</mtext></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span>.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354742"},"PeriodicalIF":1.3,"publicationDate":"2025-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170425","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":"Corrigendum to “Interfacial superconductivity in Cu/Cu2O and its effect on shielding ambient electric fields” [Physica C: Superconductivity and its Applications 632 (2025) 1354600]","authors":"Dale R. Harshman ,&nbsp;Anthony T. Fiory","doi":"10.1016/j.physc.2025.1354752","DOIUrl":"10.1016/j.physc.2025.1354752","url":null,"abstract":"","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"636 ","pages":"Article 1354752"},"PeriodicalIF":1.3,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623657","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":"Pressure dependence of the superconducting properties of the rare-earth-based Heusler compounds ReRh2Sn (Re=Sc, Y and Lu)","authors":"A. Azouaoui ,&nbsp;S. Mouchou ,&nbsp;Y. Toual ,&nbsp;A. Rezzouk ,&nbsp;K. Bouslykhane ,&nbsp;N. Benzakour ,&nbsp;A. Hourmatallah","doi":"10.1016/j.physc.2025.1354736","DOIUrl":"10.1016/j.physc.2025.1354736","url":null,"abstract":"<div><div>This study employed density functional theory (DFT) within the generalized gradient approximation (GGA) to investigate the structural, electronic, vibrational and superconductivity properties of full-Heusler compounds ReRh₂Sn (Re=Sc, Y and Lu) under pressure ranging from 0 to 10 GPa. The analysis of the results reveals that the studied compounds exhibit metallic behavior with robust dynamic stability under pressures up to 10 GPa. The superconducting properties were evaluated using the isotropic Eliashberg function, and the obtained values of the superconducting critical temperature T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span> and electron–phonon coupling constant <span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>e</mi><mi>p</mi></mrow></msub></math></span> indicate that ReRh₂Sn compounds are weak to moderate coupled superconductors. Among the studied compounds, YRh₂Sn exhibits the highest superconducting critical temperature T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span>. As the pressure increases from 0 to 10 GPa, the electron–phonon coupling constant (<span><math><msub><mrow><mi>λ</mi></mrow><mrow><mi>e</mi><mi>p</mi></mrow></msub></math></span>) decreases. This reduction, along with a decrease in the density of states at the Fermi level, leads to a decline in the superconducting critical temperature. Additionally, we report the thermodynamic parameters such as the superconducting gap <span><math><mi>Δ</mi></math></span>, the Sommerfeld constant (<span><math><mi>γ</mi></math></span>), the specific heat jump at T<span><math><msub><mrow></mrow><mrow><mtext>C</mtext></mrow></msub></math></span> and the Ginzburg–Landau parameter(<span><math><msub><mrow><mi>κ</mi></mrow><mrow><mi>G</mi><mi>L</mi></mrow></msub></math></span>). The results demonstrate that these parameters decrease with increasing pressure for ScRh₂Sn and YRh₂Sn. However, between 0 to 5 GPa, the parameters decrease, while they decrease between 5 GPa to 10 GPa.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354736"},"PeriodicalIF":1.3,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144107687","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":"Planckian dissipation and c-axis superfluid density in cuprate superconductors","authors":"Sudip Chakravarty","doi":"10.1016/j.physc.2025.1354735","DOIUrl":"10.1016/j.physc.2025.1354735","url":null,"abstract":"<div><div>An interesting concept in condensed matter physics is Planckian dissipation, in particular its manifestation in a remarkable phenomenology of superfluid density as a function of superconducting transition temperatures of cuprate high-temperature superconductors. The concept was introduced for <span><math><mrow><mi>a</mi><mi>b</mi></mrow></math></span>-plane properties. However, here I show that when suitably interpreted, it is also applicable to the <span><math><mi>c</mi></math></span>-axis resistivity, which has not been adequately addressed previously. There are two results in this note: the first is a derivation using Kubo formula as to how Planckian dissipation could arise. It is aided by the fact that the <span><math><mi>c</mi></math></span>-axis tunneling matrix element is small enough such that a second order perturbation theory combined with presumed non-Fermi liquid behavior is sufficient to illuminate the phenomenon. In addition, the notion of quantum criticality plays an important role.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354735"},"PeriodicalIF":1.3,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144099107","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":"Critical current density properties of thick YBa2Cu3Oy films with different thicknesses","authors":"S. Ito ,&nbsp;M. Kiuchi ,&nbsp;T. Horide ,&nbsp;Y. Yoshida","doi":"10.1016/j.physc.2025.1354734","DOIUrl":"10.1016/j.physc.2025.1354734","url":null,"abstract":"<div><div>Even in REBa₂Cu₃O<em>_y</em> (REBCO) films, which exhibit high critical current density (<em>J</em>_c) under low-temperature and high-magnetic-field conditions, their performance deteriorates significantly at high-temperatures because of pronounced flux creep induced by thermal agitation. This degradation is particularly pronounced in thin superconducting films, as the thickness constrains the pinning correlation length. In this study, we examined the effect of YBCO film thickness on <em>J</em>_c within the range of 0.94 to 3.7 μm. While some variations were observed depending on crystal orientation, thicker superconducting layers demonstrated a smaller reduction in <em>J</em>_c with increasing magnetic field in high-temperature regions, resulting in superior <em>J</em>_c values under high-temperature and high-magnetic-field conditions. Moreover, the apparent pinning potential <span><math><msubsup><mi>U</mi><mn>0</mn><mo>*</mo></msubsup></math></span>, determined from magnetization relaxation measurements, was larger for thicker films in these conditions, indicating that <span><math><msubsup><mi>U</mi><mn>0</mn><mo>*</mo></msubsup></math></span> is influenced by the thickness of the superconducting layer. These findings are further supported by the flux creep flow model analysis. Collectively, these results suggest that not only introducing strong pinning forces but also increasing the thickness of the superconducting layer is an effective strategy for enhancing performance near liquid nitrogen temperatures.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354734"},"PeriodicalIF":1.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143937472","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":"Going Dutch: Jan Zaanen and the strange metals consortium","authors":"M.P. Allan ,&nbsp;M.S. Golden ,&nbsp;N.E. Hussey ,&nbsp;K. Schalm ,&nbsp;H.T.C. Stoof ,&nbsp;E. van Heumen","doi":"10.1016/j.physc.2025.1354746","DOIUrl":"10.1016/j.physc.2025.1354746","url":null,"abstract":"<div><div>Under the visionary guidance of Jan Zaanen, a group of researchers within The Netherlands formed a consortium in 2018 to explore the physics of strange metals; its core objective to determine whether strange metals represent a novel quantum critical phase and whether this phase can be described by holographic emergence principles. The consortium itself brought together theorists working on, or at the boundaries of, the Anti-de Sitter/Conformal Field Theory (AdS/CFT) correspondence and experimentalists with collective expertise in optical conductivity, high-field magnetotransport, scanning tunneling spectroscopy (STS) and angle-resolved photoemission spectroscopy (ARPES). For reasons that will become apparent, the experimental team chose to perform their spectroscopy and transport studies on the same crystals of a single cuprate family – (Pb,Bi)₂Sr_2-<em>_x</em>La<em>_x</em>CuO₆₊<em>_δ</em> (Bi2201). Holographic signatures were indeed found in the nodal self energies observed by ARPES. Optical conductivity and magnetotransport also found evidence for the dual character of the strange metal phase, manifest in STS as a real-space differentiation into superconducting and non-superconducting regions. The evolution of the superconducting state with temperature and doping was found to be at odds with a conventional BCS picture. This compendium of the output of that consortium serves as both a tribute to Jan’s vision and perhaps, a signpost for how progress in such a complex field can be made through multiple experiments on the same material.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354746"},"PeriodicalIF":1.3,"publicationDate":"2025-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144134683","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":"Corrigendum to “The foot, the fan, and the cuprate phase diagram: Fermi-volume-changing quantum phase transitions” [Physica C (205) 633, 1354707 (2025)]","authors":"Subir Sachdev","doi":"10.1016/j.physc.2025.1354732","DOIUrl":"10.1016/j.physc.2025.1354732","url":null,"abstract":"","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354732"},"PeriodicalIF":1.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144194700","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 single crystals show about 50% increase of the superconducting critical temperature after Ar Ion implantation","authors":"Kriti Ranjan Sahu ,&nbsp;Thomas Wolf ,&nbsp;A K Mishra ,&nbsp;Keka R Chakraborty ,&nbsp;A Banerjee ,&nbsp;V Ganesan ,&nbsp;Udayan De","doi":"10.1016/j.physc.2025.1354733","DOIUrl":"10.1016/j.physc.2025.1354733","url":null,"abstract":"<div><div>Single crystals of a Fe-based superconductor, Ba(Fe_0.943Co_0.057)₂As₂, with ∼200 μm thickness (t) have been irradiated along the thickness (c-axis) of by 1.5 MeV Ar⁶⁺ ions, having ion range (R) of 0.903 μm (SRIM calculation). Fast ion irradiations damage the lattice of the target, and usually decrease the superconducting critical temperature (T_c), with a few exceptions of small increases. However, our irradiation, a case of ion implantation (R &gt; t), presently to a fluence of 2.5 × 10¹⁵ Ar⁶⁺/cm², increased the onset T_c of the single crystal superconductors by ∼ 8 K from its initial value of ∼ 17 K as measured from the real part of the magnetic susceptibility, matching results from our additional measurements of the imaginary part, electrical resistivity and magnetization. These self-supporting T_c results ensure correctness of the result. To our knowledge, such huge increase of the superconducting critical temperature by ion irradiation has not been reported earlier. Fortunately, we find following explanation, and consider it most appropriate. The insoluble inert gas atoms precipitate often as high-pressure miniature bubbles as is well known from various experiments and also from observations in nuclear reactor walls. This exerts a large compressive strain on the lattice. Our novel explanation is that this additional strain increases T_c by ∼ 49 %. Moreover, the same Ar implantation in non-superconducting BaFe₂As₂ induced 20 K superconductivity. Depending on such bubble formation and their stability in other target-ion pairs, such large T_c enhancement may be discovered in other superconductors, and used with the advantages of higher T_c.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"635 ","pages":"Article 1354733"},"PeriodicalIF":1.3,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170427","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 compound Ca2RuO4 within the Zaanen–Sawatzky–Allen approach","authors":"Alfonso Romano ,&nbsp;Giuseppe Cuono ,&nbsp;Jan Skolimowski ,&nbsp;Carmine Autieri ,&nbsp;Canio Noce","doi":"10.1016/j.physc.2025.1354725","DOIUrl":"10.1016/j.physc.2025.1354725","url":null,"abstract":"<div><div>Recent advancements in the application of the Zaanen–Sawatzky–Allen (ZSA) theory have significantly expanded its scope in a wide range of materials beyond standard <span><math><mrow><mn>3</mn><mi>d</mi></mrow></math></span> transition metal compounds, from high-temperature superconductors to topological insulators and low-dimensional systems. The combination of computational tools, such as dynamical mean field theory, along with experimental insights, allowed to further refine the theory, making it a valuable framework for classifying and predicting the electronic properties of large classes of complex materials with correlated electrons. Here, we extend the application of the ZSA approach to Ca<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>RuO<span><math><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></math></span>, a widely studied system where, differently from what happens in the transition metal compounds usually analyzed in this context, the relevant excitations close to the Fermi energy involve electrons coming from partially filled <span><math><mrow><mn>4</mn><mi>d</mi></mrow></math></span> shells, those of ruthenium atoms, rather than <span><math><mrow><mn>3</mn><mi>d</mi></mrow></math></span> ones.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"634 ","pages":"Article 1354725"},"PeriodicalIF":1.3,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143912273","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":"Does the Meissner effect require radial charge flow?","authors":"J.E. Hirsch","doi":"10.1016/j.physc.2025.1354724","DOIUrl":"10.1016/j.physc.2025.1354724","url":null,"abstract":"<div><div>The conventional theory of superconductivity is believed to account for the Meissner effect without radial charge flow. Instead, we have argued in earlier work that the Meissner effect is impossible in the absence of radial flow of charge because of Alfven’s theorem. Here I discuss different sample geometries that could help to determine experimentally whether or not radial charge flow is necessary for superconductors to expel magnetic fields.</div></div>","PeriodicalId":20159,"journal":{"name":"Physica C-superconductivity and Its Applications","volume":"633 ","pages":"Article 1354724"},"PeriodicalIF":1.3,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143903791","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}