Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9837434 | Physica B: Condensed Matter | 2005 | 13 Pages |
Abstract
Heavy fermion systems show pronounced elastic anomalies at low temperatures below a characteristic temperature T* where quasi-particle bands are formed. To explain these anomalies a microscopic theory of electron-phonon interaction in heavy fermion systems is considered for the Periodic Anderson Model. The volume dependence of the hybridization between the f-electrons and the conduction electrons and of the bare f-electrons gives rise to the electron-phonon interaction. The phonon propagator, the phonon self-energy and the velocity of sound in the normal state are calculated at finite temperature and long wavelength limit of phonons. The effects of the phonon coupling strengths, f-level position and the hybridization on the anomalous temperature dependence of the velocity of sound are investigated. The results are discussed on the basis of the experimental results.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
G.C. Rout, M.S. Ojha, S.N. Behera,