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This article is cited in 18 scientific papers (total in 18 papers)
CONFERENCES AND SYMPOSIA. 100th ANNIVERSARY OF THE BIRTH OF V L GINZBURG
On the structure of the superconducting order parameter in high-temperature Fe-based superconductors
T. E. Kuzmichevaa, A. V. Muratova, S. A. Kuzmichevab, A. V. Sadakova, Yu. A. Aleshchenkoac, V. A. Vlasenkoa, V. P. Martovitskya, K. S. Pervakovad, Yu. F. Eltseva, V. M. Pudalovae a Lebedev Physical Institute, Russian Academy of Sciences, Moscow
b Lomonosov Moscow State University, Faculty of Physics
c National Research Nuclear University MEPhI (Moscow Engineering Physics Institute), Moscow
d International Laboratory of High Magnetic Fields and Low Temperatures
e National Research University: Higher School of Economics, Moscow
Abstract:
We discuss the synthesis, characterization, and comprehensive study of Ba-122 single crystals with various substitutions and various superconducting transition temperatures. We use five complementary techniques to obtain a self-consistent set of data on the superconducting properties of Ba-122. A major conclusion of our 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 $k_xk_y$ plane and exhibit s-wave symmetry; the two-band model suffices for the description of the main parameters of the superconducting state. A moderate interband coupling and a considerable Coulomb repulsion in the description of the two-gap superconducting state of barium pnictides favor the ${\rm s}^{++}$ model.
Received: December 7, 2016 Accepted: October 5, 2016
Citation:
T. E. Kuzmicheva, A. V. Muratov, S. A. Kuzmichev, A. V. Sadakov, Yu. A. Aleshchenko, V. A. Vlasenko, V. P. Martovitsky, K. S. Pervakov, Yu. F. Eltsev, V. M. Pudalov, “On the structure of the superconducting order parameter in high-temperature Fe-based superconductors”, UFN, 187:4 (2017), 450–462; Phys. Usp., 60:4 (2017), 419–429
Linking options:
https://www.mathnet.ru/eng/ufn5851 https://www.mathnet.ru/eng/ufn/v187/i4/p450
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