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】
Free