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Results of Raman measurements on RNi 2 B 2 C ͑RϭLu, Ho, Y͒ single crystals are reported. Raman peaks are observed at 190 cm Ϫ1 and near 830 cm Ϫ1 . From the polarization-dependence measurements, these peaks are assigned to be the Ni-B 1g and the B-A 1g modes, respectively. Raman study on the effects of boron isotope 10 B substitution for 11 B in the LuNi 2 B 2 C crystals confirms that the mode near 830 cm Ϫ1 is due to the vibration of B atoms. However, from these single crystals, the expected Ni-E g and B-E g modes are not observed.

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