engleski

Hydrogen-induced changes in magnetic susceptibility of (Zr68Fe32)(1-x)H-x metallic glasses

The magnetisation of hydrogen-doped (Zr68Fe32)1-xHx metallic glasses has been measured in the temperature range 1.7 K -100 K for various dopant concentrations. For hydrogen concentrations x< 0.1 the samples are paramagnetic with magnetic susceptibilities that are only weakly temperature dependent down to about 35 K, below which a slight increase can be observed. For larger hydrogen concentrations the magnetic susceptibilities become strongly temperature dependent (and show the Curie-Weiss behaviour). It is found that ƒÓ(100 K) increases upon hydrogenation. This is explained by an increase in the contribution of the Fe 3d-electronic states to the density of states at the Fermi level, due to the Zr-H bond formation, which leads to an enhancement of spin fluctuations and the formation of magnetic moments on the Fe-atom site at hydrogen concentrations x> 0.1. The form and magnitude of the observed temperature dependence of the magnetic susceptibility are well accounted for with the sum of the Curie-Weiss term and the quantum corrections to the susceptibility.

galvanomagnetic effects ; disordered systems ; metals ; quantum localisation

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