Electrical resistivity and thermopower of single-crystal RNi2B2C „R5Dy, Ho, Er, Tm... magnetic superconductors

The in-plane resistivity r and thermopower S of single crystal RNi2B2C ~R5Dy, Ho, Er, Tm! has been measured from 4 to 300 K. The resistivity is linear in temperature from about 100 to 300 K, but the lowtemperature dependence goes as T with p53.0, 2.6, 2.0, and 1.4, respectively, from Dy to Tm, in comparison to the T behavior previously reported for LuNi2B2C. The thermopower exhibits a region linear in T from about 100 to 300 K where the coefficient b scales by the de Gennes factor (g21)J(J11) for different R 5Lu, Tm-Dy. The quantity S-bT is surprisingly similar in temperature dependence and magnitude for samples with R5Y, Lu, Dy-Tm, suggesting a common, nonmagnetic contribution to the thermopower of these compounds. @S0163-1829~97!07625-X#