Anomalous Self-Energy Effects of the B1g Phonon in Y1-x(Pr,Ca)xBa2Cu3O7 Films
A. Bock, S. Ostertun, R. Das Sharma, M. R"ubhausen, K. -O. Subke
Abstract
In Raman spectra of cuprate superconductors the gap shows up both directly, via a redistribution of the electronic background, the so-called "2Delta peaks", and indirectly, e.g. via the renormalization of phononic excitations. We use a model that allows us to study the redistribution and the related phonon self-energy effects simultaneously. We apply this model to the B1g phonon of Y1-x(Pr,Ca)xBa2Cu3O7 films, where Pr or Ca substitution enables us to investigate under- and overdoped samples. While various self-energy effects can be explained by the strength and energy of the 2Δpeaks, anomalies remain. We discuss possible origins of these anomalies.
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