Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-06-27
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages with 8 PS figures, RevTeX
Scientific paper
10.1103/PhysRevB.57.7773
We consider the Hubbard model with a magnetic Anderson impurity coupled to a lattice site. In the case of infinite dimensions, one-particle correlations of the impurity electron are described by the effective Hamiltonian of the two-impurity system. One of the impurities interacts with a bath of free electrons and represents the Hubbard lattice, and the other is coupled to the first impurity by the bare hybridization interaction. A study of the effective two-impurity Hamiltonian in the frame of the 1/N expansion and for the case of a weak conduction-electron interaction (small U) reveals an enhancement of the usual exponential Kondo scale. However, an intermediate interaction (U/D = 1 - 3), treated by the variational principle, leads to the loss of the exponential scale. The Kondo temperature T_K of the effective two-impurity system is calculated as a function of the hybridization parameter and it is shown that T_K decreases with an increase of U. The non-Fermi-liquid character of the Kondo effect in the intermediate regime at the half filling is discussed.
Davidovich Benny
Zevin Vilen
No associations
LandOfFree
Magnetic Impurity in a Metal with Correlated Conduction Electrons: An Infinite Dimensions Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic Impurity in a Metal with Correlated Conduction Electrons: An Infinite Dimensions Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Impurity in a Metal with Correlated Conduction Electrons: An Infinite Dimensions Approach will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-331982