Collective Modes in High-Temperature Superconductors

Details Collective Modes in High-Temperature Superconductors Collective Modes in High-Temperature Superconductors

1998-08-19

arxiv.org/abs/cond-mat/9808210v1

Physics

Condensed Matter

Superconductivity

to be published in Phys. Rev. B Nov. 1st

Scientific paper

10.1103/PhysRevB.58.12454

The role of collective modes in various experiments on the cuprates is investigated. We calculate the neutron scattering, photoemission (ARPES), and Raman scattering intensities below $T_c$ within the fluctuation-exchange (FLEX) approximation for the two-dimensional Hubbard model. It is shown that the large peak in the dynamical spin susceptibility arises from a weakly damped spin-density-wave collective mode. This gives rise to a dip between the sharp low energy peak and the higher binding energy hump in the ARPES spectrum. Furthermore, we show that the collective mode of the amplitude fluctuation of the d-wave gap yields a broad peak above the pair-breaking threshold in the $B_{1g}$ Raman spectrum.

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