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VOLUME 66 (1997) | ISSUE 3 | PAGE 184
Properties of magnetic impurity in a metal
The effect of a polarized conduction-electron cloud back on a magnetic impurity dissolved in a metal is studied. It is shown that at a temperature Tc much higher than the Kondo temperature the system becomes unstable against symmetry breaking and that a state with (5,)y0 is established. The behaviour of (Sz) is derived for all temperatures and magnetic fields except for a very narrow region around Tc and for very low temperatures. The minute role of Kondo-type processes in establishing the symmetry-broken state is pointed out. PACS: 72.l5.Eb