Tuning orbital-selective correlations in superconducting Rb0.75Fe1.6Se2−zSz
Zhe Wang, V. Tsurkan, M. Schmidt, A. Loidl, J. Deisenhofer
DOI 10.1103/PhysRevB.93.104522 · Physical Review B
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Abstract
We report on terahertz time-domain spectroscopy on superconducting and metallic iron chalcogenides Rb0.75Fe1.6Se2−zSz. The superconducting transition is reduced from Tc=32 K (z=0) to 22 K (z=1.0), and finally suppressed (z=1.4) by isoelectronic substitution of Se with S. Dielectric constant and optical conductivity exhibit a metal-to-insulator transition associated with an orbital-selective Mott phase. This orbital-selective Mott transition appears at higher temperature Tmet with increasing sulfur content, identifying sulfur substitution as an efficient parameter to tune orbital-dependent correlation effects in iron-chalcogenide superconductors. The reduced correlations of the dxy charge carriers can account for the suppression of the superconductivity and the pseudogaplike feature between Tc and Tmet that was observed for z=0.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Rb0.75Fe1.6Se2-zSz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se2-zSz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.75S0.25 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.75S0.25 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 24 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.5S0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.5S0.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.0S1.0 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Rb0.75Fe1.6Se1.0S1.0 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
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