Superconductivity with broken time-reversal symmetry in ion-irradiated Ba0.27K0.73Fe2As2 single crystals

Over the past years a lot of theoretical and experimental effort has been made to find states with broken time-reversal symmetry (BTRS) in multiband superconductors. In particular, it was proposed theoretically that in the Ba1−xKxFe2As2 system either an s+is or an s+id BTRS state may exist at high d...

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Bibliographic Details
Published in:Physical review. B 2017-06, Vol.95 (21), p.214511
Main Authors: Grinenko, V, Materne, P, Sarkar, R, Luetkens, H, Kihou, K, Lee, C H, Akhmadaliev, S, Efremov, D V, Drechsler, S-L, Klauss, H-H
Format: Article
Language:English
Subjects:
Crystals
Doping
Muon spin relaxation
Phase diagrams
Single crystals
Superconductivity
Symmetry
Transition temperature
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Summary:Over the past years a lot of theoretical and experimental effort has been made to find states with broken time-reversal symmetry (BTRS) in multiband superconductors. In particular, it was proposed theoretically that in the Ba1−xKxFe2As2 system either an s+is or an s+id BTRS state may exist at high doping levels in a narrow region of the phase diagram. Here we report the observation of an enhanced zero-field muon spin-relaxation rate below the superconducting transition temperature for a high quality crystalline sample with x≈0.73. This indicates that indeed the time-reversal symmetry is broken in superconducting Ba1−xKxFe2As2 at this doping level.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.95.214511