PRESSURE EFFECT ON MNSI - AN NMR-STUDY

The itinerant weakly helimagnetic compound MnSi has been investigated from zero-field NMR measurements on the nonmagnetic Si-29 sites in the ordered state under hydrostatic pressure up to 17.8 kbar. The charact eristic evolution of the resonance spectrum and the nuclear relaxation time T-1 is addressed with increasing pressure. Our results show clea rly the existence of a remaining local magnetic order above the critic al pressure P-c = 14.8 kbar. From 1/T1T = const. relation at low tempe rature, we extract information concerning the evolution of the density of states at the Fermi level N(epsilon(F)) as function of pressure. ( C) 1998 Elsevier Science B.V. All rights reserved.