Symmetry-imposed signatures at the pseudogap crossover in n-(BEDT-TTF)_2Xorganic superconductors

Mario Poirier; Maxime Dion; David Fournier

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Symmetry-imposed signatures at the pseudogap crossover in n-(BEDT-TTF)_2Xorganic superconductors

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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 CuN(CN)_2Br. 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 d_(xy) d_(z(r+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 d_(z(+y)) component.

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《Physical review, B. Condensed matter and materials physics》 |2011年第13期|132507:1-132507:4|共4页
作者
Mario Poirier; Maxime Dion; David Fournier;
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作者单位

Regroupement Quebecois sur les Materiaux de Pointe, Departement de Physique, Universite de Sherbrooke, Sherbrooke, Quebec,Canada J1K 2R1;

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正文语种英语
中图分类物理学;
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Symmetry-imposed signatures; pseudogap crossover; organic superconductors;

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Symmetry-imposed signatures at the pseudogap crossover in n-(BEDT-TTF)_2Xorganic superconductors

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