The effect of vanadium substitution on the structural and magnetic properties of (Fe$_{1-x}$V$_{x}$)$_{3}$Ga$_{4}$

TL;DR

This study investigates how substituting vanadium into Fe$_{3}$Ga$_{4}$ alters its structure and magnetic properties, revealing tunable magnetic phases and suppression of complex magnetic order with increasing V-doping.

Contribution

It provides new insights into the effects of vanadium doping on the structural stability and magnetic phase transitions of Fe$_{3}$Ga$_{4}$, demonstrating controlled tuning of magnetic behavior.

Findings

Linear increase in unit cell volume with V-doping

Suppression of helical AFM SDW phase at 7.5% V-doping

Altered magnetic transition temperatures with doping

Abstract

Fe$_{3}$Ga$_{4}$ displays a complex magnetic phase diagram that is sensitive and tunable with both electronic and crystallographic structure changes. In order to explore this tunability, vanadium-doped (Fe$_{1-x}$V$_{x}$)$_{3}$Ga$_{4}$ has been synthesized and characterized. High-resolution synchrotron X-ray diffraction and Rietveld refinement show that samples up to 20\% V-doping remain isostructural to Fe$_{3}$Ga$_{4}$ and display a linear increase in unit cell volume as doping is increased. Magnetic measurements reveal a suppression of the antiferromagnetic helical spin-density wave (SDW) with V-doping, revealed by changes in both the low-temperature ferromagnetic-antiferromagentic (FM-AFM) transition (T$_{1}$) and high-temperature AFM-FM transition (T$_{2}$). At 7.5\% V-doping, the metamagnetic behavior of the helical AFM SDW phase is no longer observed. These results offer an avenue to effective tuning of the magnetic order in Fe$_{3}$Ga$_{4}$ for devices, as well as increased understanding of the magnetism in this system.