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

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arxiv 1102.2434 v2 pith:ZBGDMD3X submitted 2011-02-11 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

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

Hechang Lei , Milinda Abeykoon , Emil S. Bozin , Kefeng Wang , J. B. Warren , C. Petrovic This is my paper
classification cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords diagramfe2-sekxfe2-yse2-zszoccupiedphasesitestatestoichiometry
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We report structurally tuned superconductivity in 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 poorly occupied Fe1 site and the local environment of 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 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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