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Issue 11, 2024
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On the 100th anniversary of the birth of V.L. Ginzburg. Conferences and symposia


On the structure of the superconducting order parameter in high-temperature Fe-based superconductors

 a, b,  b,  a, b, c,  b,  b,  b,  b,  b, d,  b,  b, e
a Lomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation
b Lebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation
c Lomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation
d International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka str. 95, Wroclaw, 53-421, Poland
e HSE University, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation

This paper discusses the synthesis, characterization, and comprehensive study of Ba-122 single crystals with various substitutions and various Tc's. The paper uses five complementary techniques to obtain a self-consistent set of data on the superconducting properties of Ba-122. A major conclusion of the authors work is the coexistence of two superconducting condensates differing in the electron-boson coupling strength. The two gaps that develop in distinct Fermi surface sheets are nodeless in the kxky-plane and exhibit s-wave symmetry, the two-band model represents a sufficient data description tool. A moderate interband coupling and a considerable Coulomb repulsion in the description of the two-gap superconducting state of barium pnictides favor the s++-model.

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Fulltext is also available at DOI: 10.3367/UFNe.2016.10.038002
Keywords: multi-gap superconductors, iron pnictides, specific heat, London penetration depth, Andreev spectroscopy, optics
PACS: 74.25.−q, 74.25.nd, 74.25.Ha, 74.45.+c, 74.70.Xa (all)
DOI: 10.3367/UFNe.2016.10.038002
URL: https://ufn.ru/en/articles/2017/4/g/
000405325500007
2-s2.0-85025159254
2017PhyU...60..419K
Citation: Kuzmicheva T E, Muratov A V, Kuzmichev S A, Sadakov A V, Aleshenko Yu A, Vlasenko V A, Martovitsky V P, Pervakov K S, Eltsev Yu F, Pudalov V M "On the structure of the superconducting order parameter in high-temperature Fe-based superconductors" Phys. Usp. 60 419–429 (2017)
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Received: 7th, December 2016, 5th, October 2016

Оригинал: Кузьмичёва Т Е, Муратов А В, Кузьмичёв С А, Садаков А В, Алещенко Ю А, Власенко В А, Мартовицкий В П, Перваков К С, Ельцев Ю Ф, Пудалов В М «О структуре параметра порядка в высокотемпературных сверхпроводниках на основе железа» УФН 187 450–462 (2017); DOI: 10.3367/UFNr.2016.10.038002

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