Magnetoresistance and magnetic susceptibility in CeNiSn

We have studied a metamagnetic-like anomaly in CeNiSn via measurements of t ransverse and longitudinal magnetoresistance (MR) and AC magnetic susceptib ility (chi) in a wide range of temperature T, magnetic field B, and pressur e p, i.e., 0.05 K less than or equal to T less than or equal to 0.9 K, 0 le ss than or equal to B less than or equal to 20 T, and 0 less than or equal to p less than or equal to 10kbar. We identify five field regions in which both MR and chi exhibit anomalous behavior, i.e., distinct deviation from m onotonous variation as a function of B. The disparate pressure dependence o f each regime cannot be explained by the pressure variation of a single par ameter, viz., the Kondo temperature, and suggests that the metamagnetic-lik e anomaly in CeNiSn is a combination of anomalies of different origins. (C) 2001 Elsevier Science B.V. All rights reserved.