Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Fe-based Superconductors - Fe(Se,Te), LiFeAs, and other Materials
TT 36.4: Vortrag
Mittwoch, 13. März 2013, 10:15–10:30, H18
Terahertz spectroscopy on Rb1−xFe2−ySe2 — •Zhe Wang, Jonas Fisher, Michael Schmidt, Vladimir Tsurkan, Alois Loidl, and Joachim Deisenhofer — Experimentalphysics V, EKM, Institute of Physics, University of Augsburg, Germany
Single crystals of superconducting and non-superconducting Rb1−xFe2−ySe2 [1] have been investigated by terahertz time-domain transmission spectroscopy as a function of temperature. In the superconducting samples, we observe the signatures of the superconducting transition [2] and an isosbestic point in the temperature dependence of optical conductivity in the vicinity of 100 K, which could be related to the reported phase separation in these compounds. In the non-superconducting samples, the optical conductivity exhibits features which can be interpreted in terms of spin wave excitations in agreement with neutron experiments [3].
[1] V. Tsurkan et al. Phys. Rev. B 84, 144520 (2011)
[2] A. Charnukha et al. Phys. Rev. B 85, 100504 (2012)
[3] M. Wang et al. Nature Communications 2, 580 (2011)