Mixed pairing symmetry in κ−(BEDT-TTF)2X organic superconductors from ultrasonic velocity measurements
Maxime Dion, David Fournier, Mario Poirier, Kim D. Truong, A.-M. S. Tremblay
DOI 10.1103/PhysRevB.80.220511 · Physical Review B
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9.5 | Pressure not reported | onset |
| κ-(BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.9 | Pressure not reported | onset |
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