THE 2-CHANNEL KONDO ROUTE TO NON-FERMI-LIQUID METALS

We present a pedagogical and critical overview of the two-channel Kond o model and its possible relevance to a number of non-Fermi-liquid all oys and compounds. We survey the properties of the model, how a magnet ic two-channel Kondo effect might obtain for Ce3+ ions in metals, and a quadrupolar Kondo effect for U4+ ions in metals. We suggest that the incoherent metal behaviour of the two-channel Kondo-lattice model may be useful in understanding the unusual normal-state resistivity of UB e13 and speculate that the residual resistivity and entropy of the two -channel lattice paramagnetic phase might be removed by either antifer romagnetic (or antiferroquadrupolar) ordering or by a superconducting transition to an odd-frequency pairing stale.