Optical conductivity of superconducting Rb2Fe4Se5 single crystals
A. Charnukha, J. Deisenhofer, D. Pröpper, M. Schmidt, Z. Wang, Y. Goncharov, A. N. Yaresko, V. Tsurkan, B. Keimer, A. Loidl, A. V. Boris
DOI 10.1103/PhysRevB.85.100504 · Physical Review B
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Abstract
We report the complex dielectric function of high-quality nearly-stoichiometric Rb2Fe4Se5 single crystals with Tc=32K determined by wide-band spectroscopic ellipsometry and time-domain transmission spectroscopy in the spectral range of 1meV≤ℏω≤6.5eV at temperatures of 4K≤T≤300K. This compound simultaneously displays a superconducting and a semiconducting optical response. It reveals a direct band gap of ≈0.45eV determined by a set of spin-controlled interband transitions. Below 100 K, in the lowest terahertz spectral range, we observe a clear metallic response characterized by the negative dielectric permittivity ɛ1 and bare (unscreened) ωpl≈100meV. 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Rb2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Rb2Fe4Se5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Ba0.68K0.32Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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