Douglass S. Kalika, David W. Giles, et al.
Journal of Rheology
We calculate in a k-averaging approximation, the vertex corrections for pairing at a Van Hove singularity mediated by an Einstein phonon. The vertex correction leads to a modest reduction in Tc, which can still reach the experimental values for realistic phonon couplings, and to a significant deepening of the dip in the isotope shift at the Tc maximum. Interference between first- and second-order vertex graphs diminishes the effect of the Coulomb interaction on Tc. The isotope-shift dip is shallower for repulsive Coulomb interaction, and deeper in the case of an attractive interaction introduced to model an excitonic contribution to pairing. © 1994 The American Physical Society.
Douglass S. Kalika, David W. Giles, et al.
Journal of Rheology
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Proceedings of SPIE 1989
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IEEE J-STARS