Metal flux growth of intermetallics using rare earth/transition metal eutectic melts has led to a large family of complex ternary and quaternary metal carbides, borides, and aluminides. The structures often feature transition metal chains, clusters, or layers capped by a light element. The magnetism of these compounds depends on both the rare earth element (which may exhibit ordering at low temperature) and the nature of the transition metal bonding. Extensive networks of transition metals, such as that seen in Nd2Fe14B, lead to large magnetic moments on the iron sites and resultant magnetic ordering. Compounds with little to no Fe-Fe bonding have no moment on the iron, as is seen for La15(FeC6)4H. The magnetic behavior of intermetallics that feature dimers, chains, and larger clusters of transition metals indicates that the magnetism of the transition metal depends on cluster size and can be modified by dilution with a non-magnetic element.

Magnetism of transition metals in intermetallics: Effects of cluster size

2019 Spring National Meeting

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