Undressing the Kondo effect near the antiferromagnetic quantum critical point.
The problem of a spin-1/2 magnetic impurity near an antiferromagnetic transition of the host lattice is shown to transform to a multichannel problem. A variety of fixed points is discovered asymptotically near the antiferromagnetic critical point. Among these is a new variety of stable fixed point of a multichannel Kondo problem which does not require channel isotropy. At this point Kondo screening disappears but coupling to spin fluctuations remains. In addition to its intrinsic interest, the problem is an essential ingredient in the problem of quantum critical points in heavy fermions.
Maebashi
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Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.
Miyake
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Varma
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CM