Dimensional crossover in heavy fermions

A one-parameter scaling, T-coh, describes the physical behavior of several heavy fermions in a region of their phase diagram. We fully characterize th is region, obtaining the uniform susceptibility, the resistivity and the sp ecific heat. We evaluate the Wilson and the Kadowaki-Woods ratios in this r egime. The theory of the one-parameter scaling corresponds to a zero-dimens ional approach where spatial correlations are irrelevant but time fluctuati ons are critically correlated. The crossover from d = 0 to d = 3 occurs at a length scale inversely related to the stiffness of the lifetime of the sp in fluctuations. (C) 1999 Elsevier Science B.V. All rights reserved.