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Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2

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  • A. E. Böhmer

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology
    Present address: Ames Laboratory, Iowa State University, Ames, Iowa 50011, USA (A.E.B.).)

  • F. Hardy

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology)

  • L. Wang

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology)

  • T. Wolf

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology)

  • P. Schweiss

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology)

  • C. Meingast

    (Institut für Festkörperphysik, Karlsruhe Institute of Technology)

Abstract

Detailed knowledge of the phase diagram and the nature of the competing magnetic and superconducting phases is imperative for a deeper understanding of the physics of iron-based superconductivity. Magnetism in the iron-based superconductors is usually a stripe-type spin-density-wave, which breaks the tetragonal symmetry of the lattice, and is known to compete strongly with superconductivity. Recently, it was found that in some systems an additional spin-density-wave transition occurs, which restores this tetragonal symmetry, however, its interaction with superconductivity remains unclear. Here, using thermodynamic measurements on Ba1−xKxFe2As2 single crystals, we show that the spin-density-wave phase of tetragonal symmetry competes much stronger with superconductivity than the stripe-type spin-density-wave phase, which results in a novel re-entrance of the latter at or slightly below the superconducting transition.

Suggested Citation

  • A. E. Böhmer & F. Hardy & L. Wang & T. Wolf & P. Schweiss & C. Meingast, 2015. "Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8911
    DOI: 10.1038/ncomms8911
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