paper

Importance of site occupancy and absence of strain glassy phase in Ni $_{2 - x}$ Fe $_{x}$ Mn $_{1.5}$ In $_{0.5}$

arXiv:2004.00256 · doi:10.1016/j.jallcom.2019.05.172

Abstract

Martensitic transition temperature steadily decreases in Ni $_{2 - x}$ Fe $_{x}$ Mn $_{1.5}$ In $_{0.5}$ and is completely suppressed at $x$ = 0.2. Despite suppression of martensitic transition, Ni $_{1.8}$ Fe $_{0.2}$ Mn $_{1.5}$ In $_{0.5}$ does not display the expected strain glassy phase. Instead, a ground state with dominant ferromagnetic interactions is observed. A study of structural and magnetic properties of $x$ = 0.2 reveal that the alloy consists of a major Fe rich cubic phase and a minor Fe deficient monoclinic phase favoring a ferromagnetic ground state. This is exactly opposite of that observed in Ni $_{2}$ Mn $_{1 - y}$ Fe $_{y}$ In $_{0.5}$ wherein a strain glassy phase is observed for $y$ = 0.1. The change in site symmetry of Fe when doped for Ni in contrast to Mn in the Heusler composition seems to support the growth of the ferromagnetic phase.

Importance of site occupancy and absence of strain glassy phase in Ni2−x​Fex​Mn1.5​In0.5​

Abstract

Importance of site occupancy and absence of strain glassy phase in Ni $_{2 - x}$ Fe $_{x}$ Mn $_{1.5}$ In $_{0.5}$