ANISOTROPY OF CR-LIKE ANOMALY IN U1-XCEXRU2SI2

We measured electrical resistivity in U1-xCexRu2Si2 single crystals (0 .00 less than or equal to x less than or equal to 0.050) at ambient pr essure and at hydrostatic pressures up to 9 kbar. Our measurements sho w strong anisotropy, with the in-plain resistivity rho(a) much higher than rho(c) parallel to the c-axis. The substitution of U with Ce in U Ru2Si2 reduces the transition to a Kondo coherent state and the Neel t emperature. The minimum in the Cr-like anomaly becomes more prominent but the characteristic shape of the anomaly vanishes. Low temperature characteristic features of URu2Si2, superconductivity and Fermi-liquid behaviour, vanish very rapidly with Ce substitution. The Neel tempera ture T-N increases by applying hydrostatic pressure with pressure coef ficients partial derivative T-N/partial derivative p=0.08+/-0.02 K kba r(-1) for x=0.00 and partial derivative T-N/partial derivative p=0.13/-0.02 and K kbar(-1) for x=0.025. (C) 1998 Elsevier Science S.A.