Abstract
57Fe-Mossbauer spectroscopy for the Nb1 − xHfxFe2 intermetallic series reveals the presence of local Fe 6h-site moments well above the magnetic transition temperatures determined from bulk magnetisation measurements. The techniques combine to demonstrate that the system orders antiferromagnetically at x = 0.4 with a remarkable change to strong ferromagnetic character between x = 0.7 and 0.8. Low temperature spin glass behaviour is observed for x = 0.45 to 0.79.
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