The effect of vanadium substitution on the structural and magnetic properties of (Fe${}_{1-x}$V${}_x$)${}_3$Ga${}_4$

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.