The hybrid lattice of KxFe2-ySe2: where superconductivity and magnetism coexist

Yang, Junjie; Duan, Chunruo; Huang, Qing; Brown, Craig H.; Neuefeind, Joerg C.; Louca, Despina

doi:10.1038/srep02047

Title: The hybrid lattice of K_xFe_2-ySe₂: where superconductivity and magnetism coexist

Journal Article · Tue Jan 01 00:00:00 EST 2013 · Scientific Reports

DOI:https://doi.org/10.1038/srep02047· OSTI ID:1334423

Yang, Junjie ^[1]; Duan, Chunruo ^[1]; Huang, Qing ^[2]; Brown, Craig H. ^[2]; Neuefeind, Joerg C. ^[3]; Louca, Despina ^[1]

Univ. of Virginia, Charlottesville, VA (United States)
National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Much remains unknown of the microscopic origin of superconductivity in atomically disordered systems of amorphous alloys or in crystals riddled with defects. A manifestation of this conundrum is envisaged in the highly defective superconductor of K_xFe_2-ySe₂. How can superconductivity survive under such crude conditions that call for strong electron localization? Here, we show that the Fe sublattice is locally distorted and accommodates two kinds of Fe valence environments giving rise to a bimodal bond-distribution, with short and long Fe bonds. The bimodal bonds are present even as the system becomes superconducting in the presence of antiferromagnetism, with the weight continuously shifting from the short to the long with increasing K content. Such a hybrid state is most likely found in cuprates as well while our results point to the importance of the local atomic symmetry by which exchange interactions between local moments materialize.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1334423

Journal Information:: Scientific Reports, Vol. 3; ISSN 2045-2322

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 54 works

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Effect of cation-vacancy superstructure on the phonon dynamics in ${KNi}_{2} {Se}_{2}$ Wdowik, Urszula D.; Jagło, Grzegorz; Legut, Dominik Physical Review B, Vol. 101, Issue 4 https://doi.org/10.1103/physrevb.101.045125	journal	January 2020

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