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We report a combined theoretical and experimental study of a novel quaternaryHeusler system CoFeVSb from the view point of room temperature spintronics andthermoelectric applications. It crystallizes in cubic structure with smallDO$_3$-type disorder. The presence of disorder is confirmed by room temperaturesynchrotron X-ray diffraction(XRD) and extended X-ray absorption fine structure(EXAFS) measurements. Magnetization data reveal high ordering temperature witha saturation magnetization of 2.2 $\mu_B$/f.u. Resistivity measurements reflecthalf-metallic nature. Double hysteresis loop along with asymmetry in themagnetoresistance(MR) data reveals room temperature spin-valve feature, whichremains stable even at 300 K. Hall measurements show anomalous behavior withsignificant contribution from intrinsic Berry phase. This compound also largeroom temperature power factor ($\sim0.62$ mWatt/m/K$^{2}$) and ultra lowlattice thermal conductivity ($\sim0.4$ W/m/K), making it a promising candidatefor thermoelectric application. Ab-initio calculations suggest weakhalf-metallic behavior and reduced magnetization (in agreement with experiment)in presence of DO$_3$ disorder. We have also found an energetically competingferromagnetic FM)/antiferromagnetic (AFM) interface structure within anotherwise FM matrix: one of the prerequisites for spin valve behavior.Coexistence of so many promising features in a single system is rare, and henceCoFeVSb gives a fertile platform to explore numerous applications in future.

CoFeVSb: A Promising Candidate for Spin Valve and Thermoelectric Applications