Density of States Driven Anisotropies Induced by Momentum Decoupling in High-Tc Superconductors
Abstract
Momentum decoupling arises when small momentum transfer processes dominate the electron-phonon scattering and implies that anisotropies in superconductivity are driven by the anisotropies of the density of states. Considering an isotropic s-wave interaction in the momentum decoupling regime we give a natural simultaneous explanation to various aspects of ARPES and tunnel experiments on Bi2Sr2CaCu2O8, including the correlation of gap magnitude and visibility of the dip above the gap, the enhancement of anisotropy with temperature, the presence of gap minima away from the -X direction and a gap maximum in the -X direction, the similarity of tunnel and ARPES spectra in the -M direction and the asymmetry in the SIN tunnel spectra where the dip structure is present only at negative sample bias.
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