HIGH-PRESSURE MU-SR STUDIES ON SINGLE-CRYSTALLINE GADOLINIUM

Muon spin rotation data on a single crystalline gadolinium sample have been obtained as function of temperature and hydrostatic external pre ssure up to 0.6 GPa. In the ferromagnetic state the application of pre ssure has a strong influence on the whole spin-turning-process of the spontaneous magnetization: The onset of the spin-turning is shifted to wards lower temperatures with a rate of approximately dT(st)/dp approx imate to -50 K/GPa. Higher values of the turning angle up to theta(ext ) = 90 degrees can be reached and stabilized over a wider temperature range. At low temperatures the magnetization turns back again. In the paramagnetic regime the data show a similar behaviour as under ambient pressure: both the Knight-shift and the muon spin relaxation show dev iations from their high temperature behaviour in the critical regime b elow (T - T-C) < 10 K. So there is no indication of pressure induced e ffects in this temperature range.