Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates

Details Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates

2007-07-15

arxiv.org/abs/0707.2239v1

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.76.174522

We examine the generic phase behavior of high-Tc cuprate superconductors in terms a universal van Hove singularity in the strongly overdoped region. Using a rigid ARPES-derived dispersion we solve the BCS gap equation and show that the pairing interaction or pairing energy cutoff must be a rapidly declining function of doping. This result is prejudicial to a phonon-based pairing interaction and more consistent with a magnetic or magnetically enhanced interaction.

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