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】

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