期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 13, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.137002
关键词
-
资金
- U.S. DOE [DE-AC02-98CH10886]
- Center for Emergent Superconductivity, an Energy Frontier Research Center
- U.S. DOE, Office for Basic Energy Science
We report structurally tuned superconductivity in a KxFe2-Se-y(2)-S-z(z) (0 <= z <= 2) phase diagram. Superconducting T-c 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 T-c 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.
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