Magnetic phase transitions in UNiGe under pressure

We report measurements of the electrical resistivity on a UNiGe single crys tal as a function of temperature and magnetic field (i\\B\\c-axis) performe d under hydrostatic pressures up to 1 GPa. At the magnetic-phase transition s in UNiGe pronounced anomalies are exhibited in the resistivity. Pressure- induced changes of the resistivity and magnetoresistance are primarily a co nsequence of a varying exchange coupling between the U moments, and from th ese results Further insight into the nature of the magnetic phases of this material is obtained. (C) 2000 Elsevier Science B.V. All rights reserved.