Absence of magnetic phase separation in MnSi under pressure

TL;DR

This study uses muon spin spectroscopy to investigate MnSi under pressure, revealing that the magnetic ground state remains homogeneous without phase separation up to the critical pressure where magnetic order vanishes.

Contribution

First muSR study showing absence of magnetic phase separation in MnSi under pressure, clarifying the nature of its magnetic ground state.

Findings

Magnetic order persists without phase separation up to critical pressure

Muon spin spectroscopy confirms homogeneous magnetic ground state

No evidence of phase coexistence in MnSi under pressure

Abstract

We report muon spin spectroscopy data (muSR) obtained under hydrostatic pressure on a large single crystal of the itinerant helimagnet MnSi, and recorded down to 0.235 K and up to 15.1 kbar. Up to the critical pressure p_c = 14.9 (2) kbar, where the magnetic order is suppressed, the muSR data unambiguously demonstrate that the ground state of the system is magnetic with no indication of any phase separation.