Article ID Journal Published Year Pages File Type
9841740 Physica C: Superconductivity and its Applications 2005 5 Pages PDF
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 ≳ 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 ≲ gc changes into a double-well potential for g ≳ gc. The effective pairing interaction between the conduction electrons shows a maximum at g ≈ gc where the superconducting transition temperature is expected to be maximum.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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