Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion

Lei, Hechang; Abeykoon, Milinda; Bozin, Emil S.; Wang, Kefeng; Warren, J. B.; Petrovic, C.

doi:10.1103/PhysRevLett.107.137002

Phase Diagram of $K_{x} {Fe}_{2 - y} {Se}_{2 - z} S_{z}$ and the Suppression of its Superconducting State by an $Fe 2 - Se / S$ Tetrahedron Distortion

Journal Article · Thu Sep 01 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.107.137002· OSTI ID:1385599

Lei, Hechang; Abeykoon, Milinda; Bozin, Emil S.; Wang, Kefeng; Warren, J. B.; Petrovic, C.

We report structurally tuned superconductivity in a K x Fe 2 - y Se 2 - z S 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 Fe 2 - Se / S tetrahedron is an important controlling parameter that can be used to tune the ground state in the new superconductor family.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Emergent Superconductivity (CES)

Sponsoring Organization:: USDOE SC Office of Basic Energy Sciences (SC-22)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385599

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 13 Vol. 107; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Phase Diagram of $K_{x} {Fe}_{2 - y} {Se}_{2 - z} S_{z}$ and the Suppression of its Superconducting State by an $Fe 2 - Se / S$ Tetrahedron Distortion