Suppression of the ferromagnetic order in the Heusler alloy Ni50Mn35In15 by hydrostatic pressure

TL;DR

This study investigates how hydrostatic pressure influences the magnetic and structural phases of Ni50Mn35In15, revealing pressure-induced suppression of ferromagnetism and stabilization of the martensitic phase, with significant phase coexistence effects.

Contribution

It demonstrates how hydrostatic pressure can suppress ferromagnetic order and stabilize martensitic phases in Ni50Mn35In15, providing insights into pressure-tuned magnetic and structural transitions in Heusler alloys.

Findings

Pressure stabilizes the martensitic phase and shifts transition temperatures.

Ferromagnetic order is suppressed above ~3 GPa.

Large phase coexistence region affects magnetic properties.

Abstract

We report the effect of hydrostatic pressure on the magnetic and structural properties of the shape-memory Heusler alloy Ni50Mn35In15. Magnetization and x-ray diffraction experiments were performed at hydrostatic pressures up to 5 GPa using diamond anvil cells. Pressure stabilizes the martensitic phase, shifting the martensitic transition to higher temperatures and suppresses the ferromagnetic austenitic phase. Above ~3 GPa, where the martensitic-transition temperature approaches the Curie temperature in the austenite, the magnetization shows no indication of ferromagnetic ordering anymore. We further find an extremely large temperatureregion with a mixture of martensite and austenite phases, which directly relates to the magnetic properties.