Point contacts of URu2Si2 and UPd2Al3 in high magnetic fields

The zero-bias maximum and a kink at higher voltage in the dV/dI(V) curves o f URu2Si2 point contacts (PC) below the Neel temperature T-N = 17.5 K are a pparently connected with staggered magnetic moments and an AFM transition, respectively. The magnetic field dependence (less than or equal to 28 T) gi ves the same critical field value (similar to 40 T, at 4.2 K) for both feat ures what suggests the existence of one-order parameter in the AFM state. T he dV/dI(V) curves of UPd2Al3 (T-N = 14 K) PC show at about 7 mV a maximum connected with the AFM transition which smeared out above the metamagnetic transition at 18 T, while no other phase boundary was resolved. (C) 2000 El sevier Science B.V. All rights reserved.