I. V. Zhuvagin, V. A. Vlasenko, A. S. Usoltsev, A. A. Gippius, K. S. Pervakov, A. R. Prishchepa, V. A. Prudkoglyad, S. Yu. Gavrilkin, A. D. Denishchenko, A. V. Sadakov
{"title":"Synthesis and Properties of 12442-family Superconductor","authors":"I. V. Zhuvagin, V. A. Vlasenko, A. S. Usoltsev, A. A. Gippius, K. S. Pervakov, A. R. Prishchepa, V. A. Prudkoglyad, S. Yu. Gavrilkin, A. D. Denishchenko, A. V. Sadakov","doi":"10.1134/s0021364024602021","DOIUrl":null,"url":null,"abstract":"<p>We report a synthesis of two members of recently discovered high-temperature superconductors of 12442 family, with formula MCa<sub>2</sub>Fe<sub>4</sub>As<sub>4</sub>F<sub>2</sub> (M=Rb, K) and transition temperatures of 32.7 and 34.6 K, respectively. Quality of the samples was assessed using X-ray powder diffraction, superconducting transitions were identified through transport and magnetic experiments. The temperature dependence of the upper critical field and vortex activation energy was investigated under magnetic fields up to 19 T. Two distinct thermally activated flux flow regimes were observed in both systems. Field dependences of activation energy <i>U</i><sub>0</sub>(<i>H</i>) indicate a change in the properties of vortex matter in these regimes and distinctly different dissipation mechanisms, reminiscent of cuprate HTSC.</p>","PeriodicalId":604,"journal":{"name":"JETP Letters","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s0021364024602021","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
We report a synthesis of two members of recently discovered high-temperature superconductors of 12442 family, with formula MCa2Fe4As4F2 (M=Rb, K) and transition temperatures of 32.7 and 34.6 K, respectively. Quality of the samples was assessed using X-ray powder diffraction, superconducting transitions were identified through transport and magnetic experiments. The temperature dependence of the upper critical field and vortex activation energy was investigated under magnetic fields up to 19 T. Two distinct thermally activated flux flow regimes were observed in both systems. Field dependences of activation energy U0(H) indicate a change in the properties of vortex matter in these regimes and distinctly different dissipation mechanisms, reminiscent of cuprate HTSC.
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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