Critical local-moment fluctuations,anomalous exponents,and omega/T scaling in the Kondo problem with a pseudogap |
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Authors: | Ingersent Kevin Si Qimiao |
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Institution: | Department of Physics, University of Florida, Gainesville 32611-8440, USA. |
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Abstract: | Experiments in heavy-fermion metals and related theoretical work suggest that critical local-moment fluctuations can play an important role near a zero-temperature phase transition. We study such fluctuations at the quantum critical point of a Kondo impurity model in which the density of band states vanishes as /epsilon/(r) at the Fermi energy (epsilon=0). The local spin response is described by a set of critical exponents that vary continuously with r. For 0
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