We propose a universal scaling rho*chi=const of the electrical resistivity rho with the inverse magnetic susceptibility chi^(-1) below the temperature of the quantum-coherence onset for the Ce 4f states in CeRhSb(1-x)Sn(x). In the regime, where the Kondo gap disappears (x~0.12), the system forms a non-Fermi liquid (NFL), which transforms into a Fermi liquid at higher temperature. The NFL behavior is attributed to the presence of a novel quantum critical point (QCP) at the Kondo insulator - correlated metal boundary. The divergent behavior of the resistivity, the susceptibility, and the specific heat has been determined when approaching QCP from the metallic side.
@article{arxiv.cond-mat/0412075,
title = {Universal scaling and quantum critical behavior of CeRhSb(1-x)Sn(x)},
author = {A. Slebarski and J. Spalek},
journal= {arXiv preprint arXiv:cond-mat/0412075},
year = {2009}
}