Relevance of quantum fluctuations in the Anderson-Kondo model

Details Relevance of quantum fluctuations in the Anderson-Kondo model Relevance of quantum fluctuations in the Anderson-Kondo model

2006-06-29

arxiv.org/abs/cond-mat/0606762v1

New J. Phys. 8, 127 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1088/1367-2630/8/8/127

We study a localized spin coupled to an Anderson impurity to model the situation found in higher transition metal or rare earth compounds like e.g.\ LaMnO$_3$ or Gd monopnictides. We find that, even for large quantum numbers of the localized spin, quantum fluctuations play an essential role for the case of ferromagnetic coupling between the spin and the impurity levels. For antiferromagnetic coupling, a description in terms of a classical spin is appropriate.

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