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We report the successful synthesis of a new 4$d$ based polycrystallineinverse Heusler alloy Fe$_2$RuGe by an arc melting process and have studied indetail its structural, magnetic and transport properties complemented withfirst principle calculations. X-ray and neutron diffraction, Extended X-rayAbsorption Fine Structure and $^{57}$Fe M\"{o}ssbauer spectroscopic studiesconfirm the single phase nature of the system where the Fe and Ru atoms arerandomly distributed in the 4$c$ and 4$d$ Wyckoff positions in a ratio close to50:50. The formation of the disordered structure is also confirmed by thetheoretical energy minimization calculation. Despite the random cross-sitedisorder of Fe and Ru atoms, magnetic measurements suggest not only a highCurie temperature of $\sim$860\,K, but also a large saturation magnetic moment$\sim$4.9\,$\mu_B$ per formula unit at 5\,K, considerably exceeding thetheoretical limit (4\,$\mu_B$ per formula unit) predicted by the Slater-Paulingrule. Only a few Fe-based inverse Heusler alloys are known to exhibit such highCurie temperatures. Neutron diffraction analysis coupled with the isothermalmagnetization value indicates that the magnetic moments in Fe$_2$RuGe areassociated with Fe-atoms only, which is also confirmed by M\"ossbauerspectrometry. Interestingly, in comparison to the cubic or hexagonal phase ofthe parent compound, Fe$_3$Ge, the Curie temperature of Fe$_2$RuGe hasincreased significantly despite the substitution of the nonmagnetic, yetisoelectronic element Ru in this structurally disordered compound. Ourtheoretical calculation reveals that the large Fe moment ($\sim2.8\mu_B$/Fe) onthe 4$b$ site can be attributed to a charge transfer from this Fe site towardsits Ru neighbours. Such a substantial increase in magnetic moment due toelectron charge transfer has not previously been reported in a Heusler alloysystem.

Large saturation moment and high ferromagnetic transition temperature in a structurally disordered inverse Heusler alloy Fe2RuGe