Pressure-induced shift of Tc in KxSr1−xFe2As2 (x=0.2,0.4,0.7): Analogy to the high-Tc cuprate superconductors
Melissa Gooch, Bing Lv, Bernd Lorenz, Arnold M. Guloy, Ching-Wu Chu
DOI 10.1103/PhysRevB.78.180508 · Physical Review B
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Abstract
The systematic pressure shifts of Tc were investigated in the whole phase diagram of the FeAs-based superconducting compound KxSr1−xFe2As2. Different regions, arising from corresponding responses of Tc to pressure (dTc/dp>0, ≃0, or <0), can be clearly distinguished. This reveals an interesting similarity of the FeAs superconductors and the high-Tc cuprates. This behavior is a manifestation of the layered structure of the FeAs compounds and the pressure-induced charge transfer between the (Fe2As2) and (K/Sr) layers. The coexistence of superconductivity and spin-density wave behavior were also observed, and the pressure effects on the latter is explored.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K0.2Sr0.8Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure unresolved | midpoint |
| K0.4Sr0.6Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure unresolved | onset |
| K0.7Sr0.3Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | onset |
| LaO0.89F0.11FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| SmO0.7F0.3FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
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