Optical conductivity of superconducting K0.8Fe2−ySe2 single crystals: Evidence for a Josephson-coupled phase
C. C. Homes, Z. J. Xu, J. S. Wen, G. D. Gu
DOI 10.1103/PhysRevB.85.180510 · Physical Review B
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Abstract
The optical properties of the iron-chalcogenide superconductor K0.8Fe2−ySe2 with a critical temperature Tc=31 K have been measured over a wide frequency range in the ab planes above and below Tc. The conductivity is incoherent at room temperature but becomes coherent (Drude-like) at T≳Tc; however, R□≃320 kΩ, well above the threshold for the superconductor-insulator transition at R□=h/4e2≃6.9 kΩ. Below Tc, the superfluid density ρs0≃48×103 cm−2 places this material on the scaling line ρs0/8≃4.4σdcTc, but in a region associated with Josephson coupling, suggesting this material is inhomogeneous and constitutes a Josephson phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.8Fe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | unknown |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 50 | Pressure not reported | unknown |
| (Ba1-xKx)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| FeTe1-xSex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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