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This work reports on the band structure and magneto-transport investigationsof the inverse Heusler compound Fe2CoSi. The first-principles calculationsreveal that Fe2CoSi has a very peculiar band structure with a conductingproperty in the majority spin channel and a nearly zero bandgap in the minorityspin channel. The synthesized Fe2CoSi sample shows a high-ordered inverseHeusler structure with a magnetic moment of 4.88 {\mu}B at 5 K and a high Curietemperature of 1038 K. With increasing temperature, a crossover from positiveto negative magnetoresistance (MR) is observed. Complemented with the Halleffect measurements, we suggest the intriguing crossover of MR can be ascribedto the dominant spin carriers changing from the gapless minority spin channelto the majority spin channel at Fermi level.

Crossover of magnetoresistance in the zerogap half-metallic Heusler alloy Fe2CoSi