@article{oai:niigata-u.repo.nii.ac.jp:00002120,
 author = {Mitsumoto, Keisuke and Ono, Yoshiaki},
 issue = {Supplement A},
 journal = {Journal of the Physical Society of Japan, Journal of the Physical Society of Japan},
 month = {Jul},
 note = {Using the dynamical mean-field theory, we investigate the two-orbital periodic Anderson model including both the Coulomb interaction U between f-electrons and the electron–phonon interaction g which couple the local orbital fluctuations of f -electrons with Jahn–Teller phonons. It is found that the heavy fermion state caused by U is largely enhanced due to the effect of g . In the heavy fermion state for large U and g , both the orbital and lattice fluctuations are enhanced, while the charge (valence) and spin fluctuations are suppressed; this is a nonmagnetic origin of the heavy fermions. The effect of the mass enhancement for the case with twofold-degenerate phonon mode is larger than that for one phonon mode. The obtained results show a possible nonmagnetic origin of the heavy fermion state recently observed in SmOs4Sb12., Proceedings of the International Conference on Heavy Electrons 2010 (ICHE2010)},
 pages = {SA138-1--SA138-3},
 title = {Heavy Fermions due to Cooperative Effects of Coulomb and Electron-Phonon Interactions in the Two-Orbital Periodic Anderson Model},
 volume = {80},
 year = {2011}
}