Abstract
We report a study of the spin moment in single crystal Nb${}_{(1\ensuremath{-}y)}$Fe${}_{(2+y)}$ with $y=0.015$ using spin-dependent Compton scattering in conjunction with ab initio electronic structure calculations. From the experiment, we find that the total spin moment is $0.245\ifmmode\pm\else\textpm\fi{}0.004{\ensuremath{\mu}}_{B}$. Comparison of the measured spin density with theoretical results from linearized muffin-tin orbital calculations determines there to be a ferrimagnetic arrangement of Fe moments, with the 2$a$ Fe site aligned antiparallel to the bulk moment. There is a small moment on the Nb site, also antiparallel to the net moment. The orbital moment has been determined to be $0.02\ifmmode\pm\else\textpm\fi{}0.02{\ensuremath{\mu}}_{B}$.
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