KxFe2-ySe2-zSz的Phase Diagram及Fe2-Se/S四面体畸变对其超导态的抑制
Phase Diagram of KxFe2-ySe2-zSz and the Suppression of its Superconducting State by an Fe2-Se/S Tetrahedron Distortion
摘要：
本文报道了KxFe_（2-y）Se_（2-z）Sz（0 <= z <= 2）相图中的结构调谐超导电性。超导Tc被抑制，因为S被纳入晶格，最终消失在80%的S。磁性和导电性可以与化学计量的少占Fe1位和几乎完全占据Fe2位的局部环境。降低的Tc与增加的Fe 1占有率和Fe化学计量从z = 0到z = 2的总体增加相一致。结果表明，Fe_2-Se/S四面体的不规则性是一个重要的控制参数，可以用来调节新超导体家族中的基态。
英文摘要：
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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