Theory of resistivity upturns in metallic cuprates

Article

关键词: HIGH-TEMPERATURE SUPERCONDUCTOR;    NORMAL-STATE;    DOPED YBA2CU3O7-DELTA;    THERMAL-CONDUCTIVITY;    INSULATOR CROSSOVER;    ELECTRONIC SYSTEMS;    PHASE-DIAGRAM;    LA2-XSRXCUO4;    ANTIFERROMAGNETISM;    IMPURITIES;   

DOI  :  10.1103/PhysRevB.80.134518

来源: SCIE

【 摘 要 】

We propose that the experimentally observed resistivity upturn of cuprates at low temperatures may be explained by properly accounting for the effects of disorder in a strongly correlated metallic host. Within a calculation of the dc conductivity using real-space diagonalization of a Hubbard model treated in an inhomogeneous unrestricted Hartree-Fock approximation, we find that correlations induce magnetic droplets around impurities, and give rise to additional magnetic scattering which causes the resistivity upturn. A pseudogap in the density of states is shown to enhance both the disorder-induced magnetic state and the resistivity upturns.

【 授权许可】

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