Phase Diagram of KxFe2−ySe2−zSz and the Suppression of its Superconducting State by an Fe2−Se/S Tetrahedron Distortion
Hechang Lei (雷和畅), Milinda Abeykoon, Emil S. Bozin, Kefeng Wang (王克锋), J. B. Warren, C. Petrovic
DOI 10.1103/PhysRevLett.107.137002 · Physical Review Letters
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Abstract
We report structurally tuned superconductivity in a KxFe2−ySe2−zSz (0≤z≤2) phase diagram. Superconducting Tc is suppressed as S is incorporated into the lattice, eventually vanishing at 80% of S. The magnetic and conductivity properties can be related to stoichiometry on a poorly occupied Fe1 site and the local environment of a nearly fully occupied Fe2 site. The decreasing Tc coincides with the increasing Fe1 occupancy and the overall increase in Fe stoichiometry from z=0 to z=2. Our results indicate that the irregularity of the Fe2−Se/S tetrahedron is an important controlling parameter that can be used to tune the ground state in the new superconductor family.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxFe2-ySe2-zSz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | onset |
| KxFe2-ySe2-zSz Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | onset |
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | unknown |
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