UC Irvine

The large γ of heavy-electron materials is predominantly a single-ion effect: γ α 1 TK. The most interesting physical effects occur in the low-temperature coherent state of a chemically ordered lattice of these ions. The large-γ state can be strongly quenched by magnetic order, and we argue that this effect is more pronounced for Ce than U materials. We discuss recent work in this light, and address the interesting possibility of heavy-electron materials in which charge fluctuation effects may be important. © 1988.