@article{oai:niigata-u.repo.nii.ac.jp:00002250,
 author = {Mitsumoto, Keisuke and Ono, Yoshiaki},
 journal = {Physica. C, Superconductivity, Physica. C, Superconductivity},
 month = {Oct},
 note = {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.},
 pages = {330--334},
 title = {Phonon softening and double-well potential formation due to electron-phone interaction in heavy-fermion systems},
 volume = {426-431},
 year = {2005}
}