NMR Study of MnSi under Pressure
Abstract
The magnetic phase diagram Tc(P) of the weak itinerant helimagnetic compound MnSi is reviewed upon a Nuclear Magnetic Resonance (NMR) experiment. We present a systematic study on the evolution of the NMR spin echo signal at T=1.4 K of the non-magnetic silicone sites, 29Si, up to 17.8 kbar. The pressure effect is interpreted as a weak variation of the local electronic spin polarization and the coexistence of magnetic and non magnetic Mn atoms under pressure. From the volume dependence of f0 (P), we show notably that a local magnetic order remains above the critical pressure of Pc=14.8 kbar.
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