{"title":"非磁性化学计量钙钾铁四砷化物的多重间隙超导性","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 <i>T</i><sub><i>c</i></sub> ≈ 36.1K.We have shown a coexistence of three bulk superconducting order parameters Δ<sub><i>i</i></sub>, and directly determined their magnitudes and corresponding characteristic ratios 2Δ<sub><i>i</i></sub>(0)/<i>k</i><sub><i>B</i></sub><i>T</i><sub><i>c</i></sub> ≈ 5.6, 3.9, and 1.3 at <i>T</i> <span>\\( \\ll \\)</span> <i>T</i><sub><i>c</i></sub>. 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":"{\"title\":\"Mutliple-gap Superconductivity of Nonmagnetic Stoichiometric 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 <i>T</i><sub><i>c</i></sub> ≈ 36.1K.We have shown a coexistence of three bulk superconducting order parameters Δ<sub><i>i</i></sub>, and directly determined their magnitudes and corresponding characteristic ratios 2Δ<sub><i>i</i></sub>(0)/<i>k</i><sub><i>B</i></sub><i>T</i><sub><i>c</i></sub> ≈ 5.6, 3.9, and 1.3 at <i>T</i> <span>\\\\( \\\\ll \\\\)</span> <i>T</i><sub><i>c</i></sub>. 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://doi.org/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}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"JETP Letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/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}
Mutliple-gap Superconductivity of Nonmagnetic Stoichiometric CaKFe4As4 Pnictide
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 Tc ≈ 36.1K.We have shown a coexistence of three bulk superconducting order parameters Δi, and directly determined their magnitudes and corresponding characteristic ratios 2Δi(0)/kBTc ≈ 5.6, 3.9, and 1.3 at T\( \ll \)Tc. 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.