Scientific article
Open access

Optical integral in the cuprates and the question of sum-rule violation

Publication date2007

Much attention has been given to a possible violation of the optical sum rule in the cuprates and the connection this might have to kinetic energy lowering. The optical integral is composed of a cutoff-independent term (whose temperature dependence is a measure of the sum-rule violation), plus a cutoff-dependent term that accounts for the extension of the Drude peak beyond the upper bound of the integral. We find that the temperature dependence of the optical integral in the normal state of the cuprates can be accounted for solely by the latter term, implying that the dominant contribution to the observed sum-rule violation in the normal state is due to the finite cutoff. This cutoff-dependent term is well modeled by a theory of electrons interacting with a broad spectrum of bosons.

  • Swiss National Science Foundation - 220509
  • Swiss National Science Foundation - NCCR MaNEP
Citation (ISO format)
NORMAN, M. et al. Optical integral in the cuprates and the question of sum-rule violation. In: Physical review. B, Condensed matter and materials physics, 2007, vol. 76, n° 22, p. 220509. doi: 10.1103/PhysRevB.76.220509
Main files (1)
Article (Published version)
ISSN of the journal1098-0121

Technical informations

Creation11/17/2012 10:46:00 PM
First validation11/17/2012 10:46:00 PM
Update time03/14/2023 5:45:33 PM
Status update03/14/2023 5:45:33 PM
Last indexation01/16/2024 12:32:47 AM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack