We report a new low-symmetry structure of MnSe that emerges as an intermediate phase in the structural transition between the high-temperature cubic NaCl-type structure and the low-temperature hexagonal NiAs-type structure. The formation of the intermediate phase has been observed in powder X-ray diffraction, X-ray pair distributin function, and inelastic neutron scattering experiments. We demonstrate the nanoscale nature of this intermediate phase and its dynamic formation induced by the interfacial straing generated at the interface between the cubic and hexagonal phases during the martensitic transformation.

Discovering a hidden phase of MnSe

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