Phonon anomaly in Raman active phonons of cuprates in normal state
- G. M. College, Sambalpur (India). Condensed Matter Physics Group
The authors present here a microscopic theory to explain phonon anomaly in Raman active phonons of the cuprates R{sub 2{minus}x}M{sub x}CuO{sub 4} in normal state. They used electronic Hamiltonian of Fulde in presence of antiferromagnetism. They incorporated phonon interaction to the hybridization between the conduction electrons of the system and the f-electrons. The spectral density is calculated by the Green function technique of Zubarev type at zero wave vector and low temperature limit. Temperature dependence of Raman active phonon frequencies are studied numerically to discern phonon anomalies by varying model parameters like position of f=level ({epsilon}f), the effective electron-phonon coupling strength (g), the staggered magnetic field (h) and the hybridization parameter (V). The phonon anomalies are explained on the basis of softening, hardening and temperature dependence of different Raman modes.
- OSTI ID:
- 361781
- Journal Information:
- International Journal of Modern Physics B, Vol. 13, Issue 3; Other Information: PBD: 30 Jan 1999
- Country of Publication:
- United States
- Language:
- English
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