Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-05-06
Europhys. Lett. 41, 213 (1998)
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages Revtex. Final revised version to appear in Europhys. Lett
Scientific paper
10.1209/epl/i1998-00567-2
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 S_eff > S in the presence of a magnetic field. The screening of the impurity spin is controlled by its size independently of the number of channels, in contrast to the multichannel Kondo effect for free electrons.
Granath Mats
Johannesson Henrik
Zvyagin Andrei
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