Theory of Resistivity Upturns in Metallic Cuprates

Details Theory of Resistivity Upturns in Metallic Cuprates Theory of Resistivity Upturns in Metallic Cuprates

2009-05-10

arxiv.org/abs/0905.1449v1

Phys. Rev. B 80, 134518 (2009)

Physics

Condensed Matter

Superconductivity

8 pages, 7 figures, submitted to PRB

Scientific paper

10.1103/PhysRevB.80.134518

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.

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