Deconstruction of the Kondo Effect near the AFMQuantum Critical Point.pdfVIP

APS/123-QED Deconstruction of the Kondo Effect near the AFM-Quantum Critical Point H. Maebashi,1 K. Miyake,2 and C.M. Varma3 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan 2Department of Physical Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan 3Department of Physics, University of California, Riverside, California 92521 5 (Dated: February 2, 2008) 0 The problem of a spin-1/2 magnetic impurity near an antiferromagnetic transition of the host 0 lattice is shown to transform to a multichannel problem. A variety of fixed points is discovered 2 asymptotically near the AFM-critical point. Among these is a new variety of stable fixed point r of a multichannel Kondo problem which does not require channel isotropy. At this point Kondo p screening disappears but coupling to spin-fluctuations remains. Besides its intrinsic interest, the A problem is an essential ingredient in the problem of quantum critical points in heavy-fermions. 6 1 PACS numbers: 71.10.Hf, 72.10.Fk, 75.30.Kz, 75.40.-s ] l Theories of quantum critical phenomena involving in a path-integral formulation, we obtain the effective ac- e- fermions rely on extensions of the theory of classical crit- ti