Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9841740 | Physica C: Superconductivity and its Applications | 2005 | 5 Pages |
Abstract
We investigate the periodic Anderson-Holstein model by using the dynamical mean-field theory combined with the exact diagonalization method. For the strong electron-phonon coupling g â³Â gc, the system shows an anomalous heavy-fermion behaviour which is accompanied by a large lattice fluctuation and an extreme phonon softening. We also calculate an effective potential for the ions and find that a simple harmonic potential for g â²Â gc changes into a double-well potential for g â³Â gc. The effective pairing interaction between the conduction electrons shows a maximum at g â gc where the superconducting transition temperature is expected to be maximum.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Keisuke Mitsumoto, Yoshiaki Åno,