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Heavy Fermions in the Periodic Anderson Model with Singlet-Triplet Crystal-Field Levels
Heavy Fermions in the Periodic Anderson Model with Singlet-Triplet Crystal-Field Levels
Ono, Y.
62
Mitsumoto, K.
7651
Filled skutterudite
Heavy fermion
Periodic Anderson model
Crystal-field splitting
We investigate the two-orbital periodic Anderson model with f2-configuration by using the dynamical mean-field theory in which the effective impurity Anderson model is solved using the exact diagonalization method. The renormalization factor Z and the local moment 〈S2〉 are obtained as functions of the Coulomb interaction U, the exchange (Hund's rule) coupling J and the crystal-field splitting Δ. When the ionic ground state is triplet for Δ<Δc=3J, the heavy fermion state with the mass enhancement m*/m=Z-1≳100 together with 〈S2〉～2 is realized in the strong correlation regime for U≳W, where W is the conduction bandwidth. When the ionic ground state is singlet for Δ>Δc, m*/m～1 and 〈S2〉～0 for any value of U. When the singlet ground state and the triplet excited state form a quasi-quartet for Δ≳Δc, the system shows a moderate mass enhancement m*/m～10–100.
journal article
Elsevier
2006-05
application/pdf
Physica. B, Condensed matter
378-380
694
695
Physica. B, Condensed matter
AA10673546
09214526
https://niigata-u.repo.nii.ac.jp/record/2253/files/1009.pdf
eng
info:doi/10.1016/j.physb.2006.01.224