Evidence is presented for mean free path (mfp) and spin-orbit effects contributing to the spinglass transition temperature, $T_g$, from a study of the addition of nonmagnetic impurities to spinglasses. We find a finite $T_g$ even in the limit of zero mfp and dilute moment concentration. We suggest that there must be an interaction between moments which is long ranged and yet mfp independent. For multiple-moment systems $T_g$ can be qualitatively understood, but an appropriate theoretical description is lacking.

• Received 3 August 1984

DOI:https://doi.org/10.1103/PhysRevLett.54.150