Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 12: Poster Session Superconductivity
TT 12.38: Poster
Monday, March 11, 2013, 15:00–19:00, Poster D
Optical study of LiFeAs — •A. V. Pronin1, R. P. S. M. Lobo2, G. Chanda1, J. Wosnitza1, S. Kasahara3, T. Shibauchi3, and Y. Matsuda3 — 1Dresden High Magnetic Field Laboratory (HLD), Helmholtz-Zentrum Dresden-Rossendorf, 01314 Dresden, Germany — 2LPEM, ESPCI-ParisTech, CNRS, UPMC, 10 rue Vauquelin, 75231 Paris, Cedex 5, France — 3Department of Physics, Kyoto University, Kyoto 606-8502, Japan
LiFeAs is unique among the iron-based superconductors in that it is superconducting without carrier doping and the residual resistivity ratio is very high. Thus, the determination of the superconducting gap symmetry is not complicated by the material defects. Various spectroscopic and thermodynamic measurements suggest an isotropic gap without nodes. However, no optical observations of the gap have been reported in LiFeAs. Here, we present a broad-band optical investigation of LiFeAs and discuss the frequency and temperature behavior of its complex conductivity.