Dispersion Anomalies in Cuprate Superconductors

Details Dispersion Anomalies in Cuprate Superconductors Dispersion Anomalies in Cuprate Superconductors

2004-02-11

arxiv.org/abs/cond-mat/0402304v1

Phys. Rev. B 70, 174505 (2004)

Physics

Condensed Matter

Superconductivity

12 pages, 7 eps figures

Scientific paper

10.1103/PhysRevB.70.174505

We argue that the shape of the dispersion along the nodal and antinodal directions in the cuprates can be understood as a consequence of the interaction of the electrons with collective spin excitations. In the normal state, the dispersion displays a crossover at an energy where the decay into spin fluctuations becomes relevant. In the superconducting state, the antinodal dispersion is strongly affected by the spin resonance and displays an S-shape whose magnitude scales with the resonance intensity. For nodal fermions, relevant spin excitations do not have resonance behavior, rather they are better characterized as a gapped continuum. As a consequence, the S-shape becomes a kink, and superconductivity does not affect the dispersion as strongly. Finally, we note that optical phonons typically lead to a temperature independent S-shape, in disagreement with the observed dispersion.

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