Intrinsic high-temperature superconductivity in ternary iron selenides
Shin-Ming Huang, Chung-Yu Mou, Ting-Kuo Lee
DOI 10.1103/PhysRevB.88.174510 · Physical Review B
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Abstract
We examine superconductivity in the mesoscopically mixed antiferromagnetic (AF) and superconducting (SC) phases of ternary iron selenides KyFe2−xSe2. It is shown that the interlayer hopping and AF order are key factors to determine Tc of the SC phase. In general, the hopping will produce deformed Fermi surfaces (FSs) that tend to suppress superconductivity. However, contrary to the common expectation, we find that larger AF order actually results in larger SC order, which explains the observed relatively high Tc in these phases. Furthermore, our results indicate that by reducing the interlayer hopping appropriately, phase-separated KyFe2−xSe2 may exhibit its intrinsic SC phase in the two-dimensional limit with a much higher Tc (∼65K) than what has been observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KyFe2-xSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| KyFe2-xSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 65 | Pressure not reported | unknown |
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