Open AccessMicrowave impedance study of superconducting (Li1-xFex)OHFeSe single crystal
Author(s) -
А. А. Barannik,
N. T. Cherpak,
Yuan Wu,
X. Q. Zhang,
J. Wang,
Xianlin Dong,
Lianfeng Sun,
Yingping He
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1559/1/012054
Subject(s) - london penetration depth , superconductivity , quasiparticle , condensed matter physics , penetration depth , superfluidity , single crystal , microwave , resonator , materials science , electrical resistivity and conductivity , physics , nuclear magnetic resonance , optics , optoelectronics , quantum mechanics
Microwave (MW) surface impedance Z s = R s + iX s of the recently discovered high-Tc iron-based superconductor (Li 0.84 Fe 0.16 )OHFe 0.98 Se single crystal was measured for the first time. The special X-band “hot finger" resonator allowed carrying out measurements when temperature of the sample under test can be varied from 2K to 90K and in the same time temperature of the resonator remained constant (4.2K). The unusual and important inequality R s <X s at T≥T c =42K was found. The possible reason of the observed feature is considered. The temperature dependence of the quasiparticle σ 1 and superfluid σ 2 conductivities and structure of energy gap are analyzed. Experiments show the temperature dependence of the field penetration depth as T n with n =2.8 at T<T c /3. The temperature dependence of the superfluid density confirms fully gapped behavior of a superconductor with a complex gap.