Anomalous self-energy effects of the B-1g phonon in Y1-x(Pr,Ca)(x)Ba2Cu3O7 films | |
Article | |
关键词: ELECTRONIC RAMAN-SCATTERING; D-WAVE SUPERCONDUCTORS; CUPRATE SUPERCONDUCTORS; SINGLE-CRYSTALS; YBA2CU3O7; EXCITATIONS; GAP; SPIN; FLUCTUATIONS; DEPENDENCE; | |
DOI : 10.1103/PhysRevB.60.3532 | |
来源: SCIE |
【 摘 要 】
In Raman spectra of cuprate superconductors the gap shows up both directly, via a redistribution of the electronic background, the so-called 2 Delta 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 Y1-x(Pr,Ca)(x)Ba2Cu3O7 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. [S0163-1829(99)07029-0].
【 授权许可】
Free