| There are a few metals that show both "non-Landau-Fermi-liquid" behaviour, in the sense of temperature exponents of resistivity that are less than 2 in the T → 0 K limit, together with "non-metallic-behaviour", in the sense that the resitivity is rising with decreasing temperature at T → 0K. Some of these materials have been known for a long time, others only recently discovered. I will review the literature on this problem, before describing a rather remarkable material in which the resistivity rises continuously from at least 900 K to below 100 mK, all the while however remaining a pretty good conductor. We believe that this behaviour might be a signature of the interaction of the conduction electrons with a frustrated network of spins. |
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