Abstract
Measurements of magnetization, susceptibility and Mössbauer effect were made on Zr(Fe 1− x V x ) 2 ternaries and their hydrides. Absorbed hydrogen leads to a large increase (20–30%) in volume without a change in the crystal structure. Ferromagnetism in the Fe-rich region is enhanced by hydrogen absorption, whereas hydrogenation leads to suppression of superconductivity in the V-rich range. The Fe moments in the Zr(Fe 1− x V x ) 2 hydrides are remarkably larger than those in the corresponding host compounds. The Fe moment in the β-ZrFe 2 hydride extrapolated reaches to 2.9μ B, which exceeds the saturation value in bcc Fe. The hyperfine fields of 57Fe in both Zr(Fe 0.8V 0.2) 2 and the hydride distribute widely, indicating that the Fe moments are very sensitive to the local environment arround the Fe atoms. Arguments are presented that it is possible to interprete the Fe moment increase by hydrogenation in terms of a decrease in occupancy of the 3d-band state due to electron transfers from Fe to hydrogen and/or vanadium.
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