Mixed pairing symmetry in κ-(BEDT-TTF)₂ X organic superconductors from ultrasonic velocity measurements
Dion, Maxime · Fournier, David · Poirier, Mario · Truong, Kim D. · Tremblay, A. -M. S.
Original · EN
Discontinuities in elastic constants are detected at the superconducting transition of layered organic conductors κ-(BEDT-TTF)₂X 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 A₁g+B₁g or B₂g+B₃g in the classification of irreducible representations of the orthorhombic point group D₂ₕ. Consistency with other measurements suggests that the A₁g+B₁g (dxy+dz₍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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