Multichannel Kondo screening in a one-dimensional correlated electron system
Institute of Theoretical Physics,
Chalmers University of Technology and Göteborg University, S-412 96
2 B. I. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Kharkov 310164, Ukraine
Accepted: 27 November 1997
We present the exact Bethe ansatz solution of a multichannel model of one-dimensional correlated electrons coupled antiferromagnetically to a magnetic impurity of arbitrary spin S. The solution reveals that interactions in the bulk make the magnetic impurity drive both spin and charge fluctuations, producing a mixed valence at the impurity site, with an associated effective spin in the presence of a magnetic field. The screening of the impurity is controlled by the size of the impurity spin independently of the number of channels, in contrast to the multichannel Kondo effect for free electrons.
PACS: 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 71.27.+a – Strongly correlated electron systems; heavy fermions
© EDP Sciences, 1998