Momentum decoupling arises when small-q scattering dominates the pairing interaction and implies density-of-states-driven anisotropies in superconductivity. In this scheme we explain puzzling aspects of the anisotropy in Bi2Sr2CaCu2O8, such as 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 Gamma-X direction and a gap maximum in the Gamma-X direction, the similarity of tunnel and angle-resolved photoemission spectra in the Gamma-(M) over bar direction, and the asymmetry in vacuum tunnel spectra where the dip structure is present only at negative sample bias.
Density-of-states-driven anisotropies induced by momentum decoupling in Bi2Sr2CaCu2O8
E Cappelluti;L Pietronero
1996
Abstract
Momentum decoupling arises when small-q scattering dominates the pairing interaction and implies density-of-states-driven anisotropies in superconductivity. In this scheme we explain puzzling aspects of the anisotropy in Bi2Sr2CaCu2O8, such as 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 Gamma-X direction and a gap maximum in the Gamma-X direction, the similarity of tunnel and angle-resolved photoemission spectra in the Gamma-(M) over bar direction, and the asymmetry in vacuum tunnel spectra where the dip structure is present only at negative sample bias.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
