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Title: The hybrid lattice of K xFe 2-ySe 2: where superconductivity and magnetism coexist

Abstract

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-ySe 2. 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.

Authors:
 [1];  [1];  [2];  [2];  [3];  [1]
  1. Univ. of Virginia, Charlottesville, VA (United States)
  2. National Institute of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1334423
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 3; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Yang, Junjie, Duan, Chunruo, Huang, Qing, Brown, Craig H., Neuefeind, Joerg C., and Louca, Despina. The hybrid lattice of KxFe2-ySe2: where superconductivity and magnetism coexist. United States: N. p., 2013. Web. doi:10.1038/srep02047.
Yang, Junjie, Duan, Chunruo, Huang, Qing, Brown, Craig H., Neuefeind, Joerg C., & Louca, Despina. The hybrid lattice of KxFe2-ySe2: where superconductivity and magnetism coexist. United States. doi:10.1038/srep02047.
Yang, Junjie, Duan, Chunruo, Huang, Qing, Brown, Craig H., Neuefeind, Joerg C., and Louca, Despina. Tue . "The hybrid lattice of KxFe2-ySe2: where superconductivity and magnetism coexist". United States. doi:10.1038/srep02047. https://www.osti.gov/servlets/purl/1334423.
@article{osti_1334423,
title = {The hybrid lattice of KxFe2-ySe2: where superconductivity and magnetism coexist},
author = {Yang, Junjie and Duan, Chunruo and Huang, Qing and Brown, Craig H. and Neuefeind, Joerg C. and Louca, Despina},
abstractNote = {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 KxFe2-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.},
doi = {10.1038/srep02047},
journal = {Scientific Reports},
number = ,
volume = 3,
place = {United States},
year = {2013},
month = {1}
}

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Cited by: 19 works
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