Mixed pairing symmetry in kappa-(BEDT-TTF)(2)X organic superconductors from ultrasonic velocity measurements

TitreMixed pairing symmetry in kappa-(BEDT-TTF)(2)X organic superconductors from ultrasonic velocity measurements
Type de publicationJournal Article
Nouvelles publications2009
AuteursDion, M, Fournier, D, Poirier, M, Truong, KD, Tremblay, A-MS
JournalPhysical Review B
Volume80
Pagination220511(R)/1-4
Année de publication2009
Résumé

Discontinuities in elastic constants are detected at the superconducting transition of layered organic conductors kappa-(BEDT-TTF)(2)X by longitudinal and transverse ultrasonic velocity measurements. Symmetry arguments show that discontinuities in shear elastic constants can be explained in the orthorhombic compound only if the superconducting order parameter has a mixed character that can be of two types, either A(1g)+B-1g or B-2g+B-3g in the classification of irreducible representations of the orthorhombic point group D-2h. Consistency with other measurements suggests that the A(1g)+B-1g(d(xy)+d(z(x+y))) possibility is realized. Such clear symmetry-imposed signatures of mixed order parameters have not been observed in other superconducting compounds.

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