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

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 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 2Δpeaks, anomalies remain. We discuss possible origins of these anomalies.

6 pages including 4 figures

References in corpus (2)

• Evolution of Magnetic and Superconducting Fluctuations with Doping of High-Tc Superconductors
• Electronic Raman scattering in YBCO and other superconducting cuprates

Cited by in corpus (8)

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• Superconductivity-induced Resonance Raman Scattering in Multi-layer High-Tc Superconductors
• Electron-phonon coupling in cuprate and iron-based superconductors revealed by Raman scattering
• Hole concentration and phonon renormalization in Ca-doped YBa_2Cu_3O_y (6.76 < y < 7.00)
• On the origin of the A${}_{1g}$ and B${}_{1g}$ electronic Raman scattering peaks in the superconducting state of YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Anomalous magneto-elastic coupling in Au-doped BaFe2As2
• Superconductivity-induced changes of the phonon resonances in RBa_2Cu_3O_7 (R=rare earth)