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

Böhmer, A.E.; Hardy, F.; Wang, L.; Wolf, T.; Schweiss, P.; Meingast, C.

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.

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DOI: 10.5445/IR/1000049751
DOI: 10.1038/ncomms8911
Zitationen: 88
Web of Science
Zitationen: 86
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000049751
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Nature Communications
Band 6
Seiten 7911
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Nachgewiesen in Scopus
Web of Science
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