Momentum anisotropy of the scattering rate in cuprate superconductors

Details Momentum anisotropy of the scattering rate in cuprate superconductors Momentum anisotropy of the scattering rate in cuprate superconductors

2004-10-26

arxiv.org/abs/cond-mat/0410680v1

Phys. Rev. B 71, 014517 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Extended version of cond-mat/0404385

Scientific paper

10.1103/PhysRevB.71.014517

We examine the momentum and energy dependence of the scattering rate of the high temperature cuprate superconductors using angle resolved photoemission spectroscopy. The scattering rate is of the form a + bw around the Fermi surface for under and optimal doping. The inelastic coefficient "b" is found to be isotropic. The elastic term, "a", however, is found to be highly anisotropic for under and optimally doped samples, with an anisotropy which correlates with that of the pseudogap. This is contrasted with heavily overdoped samples, which show an isotropic scattering rate and an absence of the pseudogap above T_c. We find this to be a generic property for both single and double layer compounds.

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