{"title":"Multiple-Gap Superconductivity of Nonmagnetic\nStoichiometric CaKFe4As4 Pnictide","authors":"T. E. Kuzmicheva, S. A. Kuzmichev, A. S. Medvedev","doi":"10.1134/S0021364024601313","DOIUrl":null,"url":null,"abstract":"<p>Using incoherent multiple Andreev reflection effect spectroscopy of planar break-junctions, we have studied the superconducting gap structure of CaKFe<sub>4</sub>As<sub>4</sub> pnictides (the 1144 family), those turning to the superconducting state in the stoichiometric composition with critical temperature <span>\\({{T}_{{\\text{c}}}} \\approx 36.1\\)</span> K. We have shown a coexistence of three bulk superconducting order parameters <span>\\({{\\Delta }_{i}}\\)</span>, and directly determined their magnitudes and corresponding characteristic ratios <span>\\(2{{\\Delta }_{i}}(0){\\text{/}}{{k}_{{\\text{B}}}}{{T}_{{\\text{c}}}} \\approx 5.6, 3.9\\)</span>, and 1.3 at <span>\\(T \\ll {{T}_{{\\text{c}}}}\\)</span>. We compare the gap structure of CaKFe<sub>4</sub>As<sub>4</sub> and sister pnictides of the 1144 and 122 families studied by us earlier.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S0021364024601313","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Using incoherent multiple Andreev reflection effect spectroscopy of planar break-junctions, we have studied the superconducting gap structure of CaKFe4As4 pnictides (the 1144 family), those turning to the superconducting state in the stoichiometric composition with critical temperature \({{T}_{{\text{c}}}} \approx 36.1\) K. We have shown a coexistence of three bulk superconducting order parameters \({{\Delta }_{i}}\), and directly determined their magnitudes and corresponding characteristic ratios \(2{{\Delta }_{i}}(0){\text{/}}{{k}_{{\text{B}}}}{{T}_{{\text{c}}}} \approx 5.6, 3.9\), and 1.3 at \(T \ll {{T}_{{\text{c}}}}\). We compare the gap structure of CaKFe4As4 and sister pnictides of the 1144 and 122 families studied by us earlier.
期刊介绍：
All topics of experimental and theoretical physics including gravitation, field theory, elementary particles and nuclei, plasma, nonlinear phenomena, condensed matter, superconductivity, superfluidity, lasers, and surfaces.
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