Abstract
CeBi is a prototype material for understanding the nature of any correlation between lattice structural and magnetic structural transitions in the cerium and light actinide monopnictides of NaCl–structure. These materials show complex anisotropic magnetic behavior, often with one or more magnetic transitions below TN. At TN CeBi has type I (up-down-up-down) magnetic ordering, accompanied by the onset of a tetragonal distortion. At close to TN/2, there is a first-order transition to a IA (up-up-down-down) magnetic structure. We investigate whether the I to IA magnetic transition can be explained as being driven by a lattice structural transition from a tetragonal state (with associated type I magnetic structure) to a ++−− internal rearrangement mode (with associated type IA magnetic structure) at lower temperatures. We find that a tetragonal to ++−− lattice transition only occurs with increasing temperature. Therefore other mechanisms must be sought to explain the I to IA transition.
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