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This article is cited in 9 scientific papers (total in 9 papers)
CONDENSED MATTER
Experimental evidence of three-gap superconductivity in LiFeAs
T. E. Kuzmichevaa, S. A. Kuzmichevba, I. V. Morozovc, S. Wurmehld, B. Büchnered a Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991 Russia
b Faculty of Physics, Moscow State University, Moscow, 119991 Russia
c Faculty of Chemistry, Moscow State University, Moscow, 119991 Russia
d Leibniz Institute for Solid State and Materials Research Dresden, Dresden, D-01069 Germany
e Institut für Festkörper und Materialphysik, Technische Universität Dresden, D-01069 Dresden, Germany
Abstract:
Despite the simple crystal structure, LiFeAs having nontrivial band structure and anisotropy of superconducting properties seems the most exotic compound among iron-based superconducting pnictides. Nonetheless, the available experimental studies are not so numerous due to LiFeAs chemical instability even in presence of a trace amount of water vapors or oxygen. Here, using the Andreev spectroscopy of break junctions in LiFeAs single crystals, we unambiguously show a coexistence of three superconducting condensates below critical $T_c = 17$ K. The temperature dependences of the order parameters and the anisotropy of the middle and the large gaps, as well as the excess Andreev current, and zero-bias conductance are directly measured. We estimate the partial band contributions to the total conductance. Additionally, considered is an influence of the band structure topology near the Fermi level on the dynamic conductance in the Andreev regime.
Received: 27.02.2020 Revised: 27.02.2020 Accepted: 27.02.2020
Citation:
T. E. Kuzmicheva, S. A. Kuzmichev, I. V. Morozov, S. Wurmehl, B. Büchner, “Experimental evidence of three-gap superconductivity in LiFeAs”, Pis'ma v Zh. Èksper. Teoret. Fiz., 111:6 (2020), 388–395; JETP Letters, 111:6 (2020), 350–356
Linking options:
https://www.mathnet.ru/eng/jetpl6136 https://www.mathnet.ru/eng/jetpl/v111/i6/p388
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Abstract page: | 135 | Full-text PDF : | 8 | References: | 17 | First page: | 5 |
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