Undercompensated kondo impurity with quantum critical point |
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Authors: | Schlottmann |
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Affiliation: | Department of Physics, Florida State University, Tallahassee, Florida 32306, USA. |
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Abstract: | The low-temperature properties of a magnetic impurity of spin S interacting with an electron gas via anisotropic spin exchange are studied via Bethe's ansatz. For S>1/2 the impurity is only partially compensated at T = 0, leaving an effective spin that is neither integer nor half integer. The entropy has an essential singularity at H = T = 0, and the susceptibility and the specific heat follow power laws of H and T with nonuniversal exponents, which are the consequence of a quantum critical point. The results for the generalization to an arbitrary number of channels are also reported. |
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