UC Irvine

We have performed polarized Raman scattering experiments on single-crystal samples of UPt3 in the temperature range 5 KT340 K. Four of the five Raman-allowed phonons have been observed, and their symmetries identified. None of these phonons is seen to demonstrate any anomalous behavior, contrary to previous Raman scattering results. Additionally, quasielastic scattering from spin fluctuations has been observed, having the symmetry of the antisymmetric representation, A2g, and displaying a slightly temperature-dependent half width at half maximum. The energy scale of this scattering is consistent with results reported earlier by both neutron scattering at q1 A-1 and Raman scattering at q=0 (where q, is the momentum transfer) suggesting that the spin-fluctuation relaxation is q-independent. © 1988 The American Physical Society.