Abstract
The thermal expansion coefficient α of YMn 2 just above its Néel temperature ( T N = 90K) is about 45 × 10 −6 K −1, it takes a value of 53 × 10 −6 K −1 at room temperature and passes through a maximum around 350 K. This unusual behaviour of α(T) and the higher value (if compared with other known spin fluctuation systems such as YCo 2) has been attributed to electronic instabilities of the Mn ions. In the present investigation it is shown that - when changing the environment of an individual Mn ion by substituting Mn by Fe — α decreases very quickly with increasing Fe content. This has been considered as a proof that the electronic instabilities of the Mn ions depend very sensitively on the surroundings.
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