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

A. E. Böhmer, F. Hardy, L. Wang, T. Wolf, P. Schweiss and C. Meingast ()
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A. E. Böhmer: Institut für Festkörperphysik, Karlsruhe Institute of Technology
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

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms8911

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