Abstract
We study Raman intensity and the density of states in isotropic two-dimensional d-wave superconductors. For an ideal gas, and have sharp peaks at and respectively, where is the maximum value of the gap. We study how the peak positions are affected by the fermionic damping due to impurity scattering. We show that while the damping generally shifts the peak positions to larger frequencies, the peak in still occurs at almost twice the peak position in and therefore cannot account for the experimentally observed downturn shift of the peak frequency in in underdoped cuprates compared to twice that in We also discuss how the fermionic damping affects the dynamical spin susceptibility.
- Received 7 October 1999
DOI:https://doi.org/10.1103/PhysRevB.61.R6467
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