Regensburg 2016 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Superconductivity: Fe-based Superconductors - FeSe
TT 46.3: Vortrag
Mittwoch, 9. März 2016, 10:30–10:45, H19
Tuning orbital-selective correlation effects in the superconducting iron chalcogenides Rb1−xFe1.6Se2−zSz — •Zhe Wang1, Vladimir Tsurkan1,2, Michael Schmidt1, Alois Loidl1, and Joachim Deisenhofer1 — 1Experimetal Physics V, University of Augsburg, Augsburg, Germany — 2Institute of Applied Physics, Academy of Sciences of Moldova, Chisinau, Republic of Moldova
We report a terahertz time-domain spectroscopy study on superconducting and metallic iron chalcogenides Rb1−xFe1.6Se2−zSz [1,2]. With increasing sulfur doping the superconducting transition is reduced from Tc = 32 K for z = 0 and finally suppressed at z = 1.4 [1]. The dielectric constant and the optical conductivity exhibit a metal-to-insulator-type transition associated to an orbital-selective Mott phase [2]. This orbital-selective Mott transition appears at Tmet = 90 K for z = 0 and shifts to higher temperatures for higher doping levels [1], identifying sulfur substitution as an efficient parameter to tune orbital-dependent correlation effects in the iron-chalcogenide superconductors. The reduced correlation strength of the dxy charge carriers may also account for the suppression of the pseudogap-like feature between Tc and Tmet that was observed for z = 0 [2].
Zhe Wang, V. Tsurkan, A. Loidl, and J. Deisenhofer,
arXiv:1506.04614
Zhe Wang, M. Schmidt, J. Fischer, V. Tsurkan, M. Greger,
D. Vollhardt, A. Loidl, and J. Deisenhofer,
Nature Comm. 5, 3202 (2014)