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The efficient production of spin-polarized currents at room temperature isfundamental to the advancement of spintronics. Spin-filter materials ---semiconductors with unequal band gaps for each spin channel --- can generatespin-polarized current without the need for spin-polarized contacts. Inaddition, a spin-filter material with zero magnetic moment would have theadvantage of not producing strong fringing fields that would interfere withneighboring electronic components and limit the volume density of devices. Thequaternary Heusler compound CrVTiAl has been predicted to be a zero-momentspin-filter material with a Curie temperature in excess of 1000 K. In thiswork, CrVTiAl has been synthesized with a lattice constant of $a = 6.15 \AA$.Magnetization measurements reveal an exceptionally low moment of $\mu = 2.3\times 10^{-3} \mu_B/f.u.$ at a field of $\mu_0 H = 2 T$, that is independentof temperature between T = 10 K and 400 K, consistent with the predictedzero-moment ferrimagnetism. Transport measurements reveal a combination ofmetallic and semiconducting components to the resistivity. Combining azero-moment spin-filter material with nonmagnetic electrodes would lead to anessentially nonmagnetic spin injector. These results suggest that CrVTiAl is apromising candidate for further research in the field of spintronics.

Synthesis of low-moment CrVTiAl: a potential room temperature spin filter