Transport properties of strongly correlated metals: A dynamical mean-field approach

Article

关键词: LAYERED PEROVSKITE SUPERCONDUCTOR;    DIMENSIONAL HUBBARD-MODEL;    IMPURITY ANDERSON MODEL;    FERMI-LIQUID BEHAVIOR;    HEAVY-FERMION;    THERMOELECTRIC-POWER;    ELECTRONIC-STRUCTURE;    INFINITE DIMENSIONS;    ELECTRICAL-RESISTIVITY;    INFRARED CONDUCTIVITY;   

DOI  :  10.1103/PhysRevB.61.7996

来源: SCIE

【 摘 要 】

The temperature dependence of the transport properties of the metallic phase of a frustrated Hubbard model on the hypercubic lattice at half-filling is calculated. Dynamical mean-held theory, which maps the Hubbard model onto a single impurity,Anderson model that is solved self-consistently, and becomes exact in the limit of large dimensionality, is used. As the temperature increases there is a smooth crossover from coherent Fermi liquid excitations at low temperatures to incoherent excitations at high temperatures. This crossover leads to a nonmonotonic temperature dependence for the resistance, thermopower, and Hall coefficient, unlike in conventional metals. The resistance smoothly increases from a quadratic temperature dependence at low temperatures to large values which can exceed the Mott-Ioffe-Regel value ha/e(2) (where a is a lattice constant) associated with mean free paths less than a lattice constant. Further signatures of the thermal destruction of quasiparticle excitations are a peak in the thermopower and the absence of a Drude peak in the optical conductivity. The results presented here are relevant to a wide range of strongly correlated metals, including transition metal oxides, strontium ruthenates, and organic metals.

【 授权许可】

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