Anomalous Self-Energy Effects of the B_1g Phonon in Y_{1-x}(Pr,Ca)_xBa_2Cu_3O_7 Films

• Published in: arXiv.org
• Main Authors: Bock, A, Ostertun, S, R Das Sharma, M R"ubhausen, K -O Subke
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 25.08.1999
• Subjects: Anomalies; Phonons; Raman spectra
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.9908355

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 B_1g phonon of Y_{1-x}(Pr,Ca)_xBa_2Cu_3O_7 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 2\Delta peaks, anomalies remain. We discuss possible origins of these anomalies.