DYNAMIC SPIN PROPERTIES OF LA1.98SR0.02CUO4

Neutron scattering experiments have been performed to study the dynami c spin properties of La1.98Sr0.02CuO4, a crystal with just enough Sr t o destroy three-dimensional long range magnetic order and induce spin- glass behavior at low temperatures. The q-integrated susceptibility in tergral d2q2D Im chi2D(q2D, omega) follows the scaling function of ome ga / T suggested by Keimer et al. Below 3 meV, however, clear deviatio n from the scaling function is observed at low temperatures. This prob ably originates from a gap in the spin-wave-like excitations due to th e out-of-plane anisotropy.