Abstract
The thermal expansion anomaly in amorphous Y 100− x Fe x (70 ⩽ x ⩽ 92.5) alloys has been measured with a differential transformer-type dilatometer. A large thermal expansion anomaly is observed in spite of the absence of ferromagnetism, and its magnitude is as large as that of amorphous LuFe alloys which exhibit a re-entrant spin-glass behavior. This clearly indicates that the magnetovolume effect is not necessarily correlated with the appearance of ferromagnetism. The large negative electronic contribution to the thermal expansion coefficient of amorphous YFe alloys is similar to that of Fe-based FeNi alloys. Such a characteristic property is explained by taking into account the amplitude of the local moment.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have