Abstract:U4+ is used to probe the incommensurate structure of ThBr 4 via absorption and magnetic circular dichroism (MCD) measurements. Below Tc = 95 K, the crystal field experienced by U 4+ ions is either of D2d or D2 symmetry. This can be simulated by varying a phase angle ϕ form 0(D 2d) to ± π/2 (D2). One very neat advantage of MCD over absorption is that the D2d centres show up very clearly in the former due to the occurrence of a derivative-like singularity. We present a model to simulate absorption, Zeeman and MC… Show more
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