SPIN FLUCTUATIONS IN THE VICINITY OF A CHARGED-PARTICLE IN SOLID HE-3

At low temperature the positively charged muon (mu(+)) in solid He-3 i s localized in a polaron which, unlike a chemically bound complex, is held together with polarizational attraction (van der Waals force). Th e dynamic effects in the muon relaxation are determined by the spin ex change of the He-3 atoms in the polaron. In crystals with large molar volumes (melting pressure P-m < 60 bar) the rate of magnetic field flu ctuations at the muon site is at least one order of magnitude lower th an in an unperturbed crystal. In an external electric field the mu(+) produces an anisotropic local distortion which reduces the rate of the local He-3 spin exchange and leads to an increase of the muon spin re laxation rate.