Magnetization under High Pressure in MnSi

TL;DR

This study investigates how high pressure affects magnetization in MnSi, revealing the suppression of magnetic order and changes in spin fluctuation temperatures as the system approaches a critical pressure.

Contribution

It provides a detailed analysis of pressure-induced changes in magnetization and spin fluctuations in MnSi using the SCR theory and Arrot-plot analysis.

Findings

Saturated magnetization decreases with pressure

Curie temperature decreases with pressure

Spin fluctuation temperatures evolve near critical pressure

Abstract

The magnetization M(H) has been measured in the weakly helimagnetic itinerant compound MnSi under high pressure up to 10.2 kbar and high magnetic field up to 9 Tesla. We interpret the simultaneous decrease under pressure of the saturated magnetization, $p_s$, and the Curie temperature, $% T_c$ in the frame of the self-consistent renormalization theory (SCR) of spin fluctuations. From the analysis of the so-called Arrot-plot ($H/p [ H,T ] $ versus $p^2[ H,T ] $) and the respective volume dependence of $p_s$ and $T_c$, we estimate the evolution of the characteristic spin fluctuation temperatures, $T_0$ and $T_A$ when the system approaches its critical pressure, $P_c$=15 kbar, corresponding to the disappearance of the long range magnetic order at T=0.