High Frequency Behavior of the Infrared Conductivity of Cuprates

Details High Frequency Behavior of the Infrared Conductivity of Cuprates High Frequency Behavior of the Infrared Conductivity of Cuprates

2005-11-23

arxiv.org/abs/cond-mat/0511584v1

Phys. Rev. B 73, 140501 (R) (2006)

Physics

Condensed Matter

Superconductivity

4 pages

Scientific paper

10.1103/PhysRevB.73.140501

We analyze recent infrared conductivity data in the normal state of the cuprates. We find that the high frequency behavior, which has been suggested as evidence for quantum critical scaling, is generally characteristic of electrons interacting with a broad spectrum of bosons. From explicit calculations, we find a frequency exponent for the modulus of the conductivity, and a phase angle, in good agreement with experiment. The data indicate an upper cut-off of the boson spectrum of order 300 meV. This implies that the bosons are of electronic origin rather than phonons.

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