Local structural disorder and superconductivity in K0.69(2)Fe1.45(1)Se2.00(1)

Details Local structural disorder and superconductivity in K0.69(2)Fe1.45(1)Se2.00(1) Local structural disorder and superconductivity in K0.69(2)Fe1.45(1)Se2.00(1)

2011-11-10

arxiv.org/abs/1111.2597v1

Physics

Condensed Matter

Superconductivity

4 figures, 5 pages

Scientific paper

We report significantly enhanced magnetic moment in K0.69(2)Fe1.45(1)Se2.00(1) single crystals with sharp Tc and bulk superconductivity obtained by post-annealing and quenching process. There are two Fe sites in 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 K0.69(2)Fe1.45(1)Se2.00(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.

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