Evolution of structure, magnetism, and electronic/thermal-transports of Ti(Cr)-substituted Fe2CrV all-d-metal Heusler ferromagnets

TL;DR

This study investigates how substituting Ti and Cr in Fe2CrV Heusler alloys affects their structure, magnetism, and transport properties through combined theoretical and experimental methods.

Contribution

It provides a comprehensive analysis of the structural, magnetic, and transport evolution in Ti- and Cr-substituted Fe2CrV alloys, highlighting the effects of doping on their properties.

Findings

Magnetic moments decrease linearly with Ti doping.

Experimental magnetization aligns with theoretical predictions for x<4.

Electrical and thermal transport properties peak at stoichiometric composition.

Abstract

All-d-metal full-Heusler alloys possess superior mechanical properties and high spin polarization, which would play an important role in spintronic applications. Despite this, their electrical and thermal transport properties have not been comprehensively investigated till now. In this work, we present an analysis on the evolution of structural, magnetic and transport properties of Cr- and Ti-substituted Fe2CrV all-d-metal Heusler alloys by combining theoretical calculations and experiments. Both series of alloys crystallize in Hg2CuTi-type structure. With increasing Ti doping, the calculated total magnetic moments of Fe50Cr25V25-xTix decrease linearly. The experimental saturation magnetization is highly consistent with theoretical calculations and Slater-Pauling rule when x < 4, indicating the highly ordered atomic occupation. The magnetization and Curie temperature can be significantly tuned by altering spin polarizations and exchange interactions. The introduction of the foreign atom, Ti, results in a linear increase in residual resistivity, while electron-phonon scattering keeps relatively constant. The maximum values for electrical and thermal transport properties are observed in the stoichiometric Fe2CrV composition.