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, Department 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 National Research University Higher School of Economics, 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.

Fulltext is available at IOP
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
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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TI On the structure of the superconducting order parameter in high-temperature Fe-based superconductors
AU Kuzmicheva, T. E.
AU Muratov, A. V.
AU Kuzmichev, S. A.
AU Sadakov, A. V.
AU Aleshenko, Yu. A.
AU Vlasenko, V. A.
AU Martovitsky, V. P.
AU Pervakov, K. S.
AU Eltsev, Yu. F.
AU Pudalov, V. M.
PB Physics-Uspekhi
PY 2017
JO Physics-Uspekhi
JF Physics-Uspekhi
JA Phys. Usp.
VL 60
IS 4
SP 419-429

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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