Abstract

A neutron diffraction study of magnetite below the Verwey transition (123 K) reveals that the superlattice reflections are observed for ( hhl), with l = integers +1 2 but not for ( hhl). This determines a (110) glide plane in the direction of [100] and implies that only one of the doubly degenerate modes, proposed recently by Yamada, condenses at the transition.

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