Local structural disorder and superconductivity in KxFe2-ySe2

Title
Local structural disorder and superconductivity in KxFe2-ySe2
Authors
류혜진Hechang LeiA. I. FrenkelC. Petrovic
Issue Date
2012-06
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 85, NO 22, 224515
Abstract
We report significantly enhanced magnetic moment in K0.69(2)Fe1.45(1)Se2.00(1) single crystals with sharp T-c and bulk superconductivity obtained by postannealing and quenching process. There are two Fe sites in the K0.69(2)Fe1.45(1)Se2.00(1) unit cell: Fe1, which has higher symmetry with longer average Fe-Se bond length, and Fe2, which has lower symmetry with shorter average Fe-Se bond length. Temperature-dependent x-ray absorption fine-structure (XAFS) analysis results on quenched and as-grown K0.69(2)Fe1.45(1)Se2.00(1) crystals show that quenched K-0.69(2) Fe-1.45(1) Se-2.00(1) have increased average Fe-Se bond length and decreased static disorder. Our results indicate that nonzero population of Fe1 sites is the key structural parameter that governs the bulk superconductivity. We also show clear evidence that Fe1 sites carry higher magnetic moment than Fe2 sites.
URI
http://pubs.kist.re.kr/handle/201004/70298
ISSN
2469-9950
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KIST Publication > Article
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