Local structural disorder and superconductivity in K x Fe 2-y Se 2

Ryu, Hyejin; Lei, Hechang; Frenkel, A. I.; Petrovic, C.

doi:10.1103/PhysRevB.85.224515

Title: Local structural disorder and superconductivity in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$

Journal Article · Fri Jun 01 00:00:00 EDT 2012 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.85.224515· OSTI ID:1385609

Ryu, Hyejin; Lei, Hechang; Frenkel, A. I.; Petrovic, C.

We report significantly enhanced magnetic moment in K 0.69 ( 2 ) Fe 1.45 ( 1 ) Se 2.00 ( 1 ) single crystals with sharp T c and bulk superconductivity obtained by postannealing and quenching process. There are two Fe sites in the K 0.69 ( 2 ) Fe 1.45 ( 1 ) Se 2.00 ( 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 K 0.69 ( 2 ) Fe 1.45 ( 1 ) Se 2.00 ( 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.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-98CH10886

OSTI ID:: 1385609

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 85, Issue 22; Related Information: CES partners with Brookhaven National Laboratory (BNL); Argonne National Laboratory; University of Illinois, Urbana-Champaign; Los Alamos National Laboratory; ISSN 1098-0121

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Local structural disorder and superconductivity in K $_{x}$ Fe $_{2 - y}$ Se $_{2}$