Pressure-induced structural-phase transition of CeRu2

Electrical resistivity of cubic Laves-phase compound CeRu2, has been measur ed from 3 to 300 K under the quasi-hydrostatics pressure P from 1.5 up to 8 GPa. X-ray diffraction was performed :It room temperature under the pressu re up to 15 GPa. Temperature dependence of electrical resistivity rho(T) sh ows no anomaly at pressures below 5 GPa and resistivity decreases with incr easing pressure. However, rho(T) curves, measured under the pressure above 5.5 GPa. reveal an abrupt decrease at critical temperature T,. This indicat es that a new phase is induced by the pressure. T, shows a large pressure d ependence: Delta T-a/Delta P = 59.2 K/GPa. According to the X-ray data, the phase transition above 5.5 GPa is a structural-phase transition. (C) 2000 Elsevier Science B.V. All rights reserved.