Symmetry-imposed signatures at the pseudogap crossover in κ-(BEDT-TTF)2X organic superconductors
Mario Poirier, Maxime Dion, David Fournier
DOI 10.1103/PhysRevB.83.132507 · Physical Review B
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Abstract
Very large softening anomalies are detected on particular shear elastic moduli at the pseudogap crossover line in the layered organic conductors κ-(ET)2X, X = Cu(SCN)2 and Cu[N(CN)2]Br. Symmetry properties at this crossover cannot be explained by a compressible Hubbard model with isotropic coupling to the lattice degrees of freedom. We observed that an anomaly is present or not on a shear modulus if, and only if, a corresponding anomaly appears at the superconducting transition. This observation suggests a symmetry driven correspondence between the superconducting phase and the pseudogap crossover in these layered organics. Since the mixed character dxy+dz(x+y) was advanced for the superconducting phase, this suggests that a new theoretical approach to the pseudogap behavior is needed and reemphasizes the significance of the interlayer hopping which is implied in the dz(x+y) component.
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