DYNAMICS OF MUONS IN THE FERROELECTRIC MATERIAL KDP

Muon spin relaxation in zero field and longitudinal field was measured in single crystal samples of KH2PO4 (KDP) and KD2PO4 (DKDP) over a te mperature range of 5 K to 300 K. At low temperatures, diamagnetic muon s and muon substituted radicals with nuclear hyperfine coupling can be observed. For both KDP and DKDP, a minor change was observed in the d ynamics of the muon below 140 K. Above 140 K, the mobility of the muon appears to increase and the diffusion rate becomes faster with increa sing temperature. Only a small increase in the relaxation rate is obse rved in KDP due to the presence of the H+, suggesting that the relaxat ion effects probably originate from the P-31.