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Optical conductivity of superconducting Rb2Fe4Se5

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arxiv 1108.5698 v1 pith:GNUDOCDK submitted 2011-08-29 cond-mat.supr-con cond-mat.str-el

A. Charnukha , J. Deisenhofer , D. Pröpper , M. Schmidt , Z. Wang , Y. Goncharov , A. N. Yaresko , V. Tsurkan
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B. Keimer A. Loidl A. V. Boris
This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords superconductingresponsebelowcompounddetermineddielectricmetallicomega
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abstract

We report the complex dielectric function of high-quality nearly-stoichiometric Rb2Fe4Se5 (RFS) single crystals with Tc=32 K determined by wide-band spectroscopic ellipsometry and time-domain transmission spectroscopy in the spectral range 1 meV<=$\hbar$\omega<=6.5 eV at temperatures 4 K<=T<=300 K. This compound simultaneously displays a superconducting and a semiconducting optical response. It reveals a direct band-gap of 0.45 eV determined by a set of spin-controlled interband transitions. Below 100 K we observe in the lowest THz spectral range a clear metallic response characterized by the negative dielectric permittivity \epsilon 1 and bare (unscreened) \omega pl=100 meV. At the superconducting transition this metallic response exhibits a signature of a superconducting gap below 8 meV. Our findings suggest a coexistence of superconductivity and magnetism in this compound as two separate phases.

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