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
T.E. Kuzmichevaa,b,
A.V. Muratovb,
S.A. Kuzmicheva,b,c,
A.V. Sadakovb,
Yu.A. Aleshenkob,
V.A. Vlasenkob,
V.P. Martovitskyb,
K.S. Pervakovb,d,
Yu.F. Eltsevb,
V.M. Pudalovb,e aLomonosov Moscow State University, Faculty of Physics, Leninskie Gory 1 build. 2, Moscow, 119991, Russian Federation bLebedev Physical Institute, Russian Academy of Sciences, Leninsky prosp. 53, Moscow, 119991, Russian Federation cLomonosov Moscow State University, Vorobevy Gory, Moscow, 119991, Russian Federation dInternational Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka str. 95, Wroclaw, 53-421, Poland eHSE 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.
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)
PT Journal Article
TI On the structure of the superconducting order parameter in high-temperature Fe-based superconductors
AU Kuzmicheva T E
FAU Kuzmicheva TE
AU Muratov A V
FAU Muratov AV
AU Kuzmichev S A
FAU Kuzmichev SA
AU Sadakov A V
FAU Sadakov AV
AU Aleshenko Yu A
FAU Aleshenko YA
AU Vlasenko V A
FAU Vlasenko VA
AU Martovitsky V P
FAU Martovitsky VP
AU Pervakov K S
FAU Pervakov KS
AU Eltsev Yu F
FAU Eltsev YF
AU Pudalov V M
FAU Pudalov VM
DP 10 Apr, 2017
TA Phys. Usp.
VI 60
IP 4
PG 419-429
RX 10.3367/UFNe.2016.10.038002
URL https://ufn.ru/en/articles/2017/4/g/
SO Phys. Usp. 2017 Apr 10;60(4):419-429
Received: 7th, December 2016, accepted: 5th, October 2016