Neutron scattering evidence on Lifshitz behavior in MnP

Abstract
We have measured the variation of q↘ in the fan phase of MnP in order to test whether the para-ferro-fan triple point is a Lifshitz point. Along the para-fan phase boundary, q↘ continuously decreases as the triple point is approached, extrapolating to zero at a temperature in good agreement with other measurements of the triple point. The temperature dependence of q↘ along this phase boundary is in approximate agreement with theoretical expectations for Lifshitz point behavior. These data support the conclusion that the triple point is a Lifshitz point.

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