Electrical resistivity and magnetoresistance (Delta rho/rho) measureme
nts on a series of (U1-xYx)Ru2Si2 (0 less than or equal to x less than
or equal to 0.9) compounds in the temperature range 4.2-300 K and in
magnetic fields up to 45 kOe are reported. The resistivity measurement
s do not show any signature of antiferromagnetism for x > 0.5. The com
pound URu2Si2 exhibits a large, positive (Delta rho/rho) presumably du
e to destruction of Kondo coherence as well as due to antiferromagneti
sm. The presence of even 5% Y at U-site weakens the Kondo coherence an
d reduces the magnetoresistance considerably.