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J Phys Condens Matter. 2017 Jan 6;29(8):085401. doi: 10.1088/1361-648X/aa5477. [Epub ahead of print]

High-pressure single-crystal synchrotron diffraction study of MnGe and related compounds.

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Saint Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint-Petersburg, Russia.


Single crystal synchrotron diffraction for pressures up to 50 GPa has revealed an essential difference in structural properties and compressibility of MnGe compared with Mn1-x Co x Ge and Mn1-x Fe x Ge solid solutions. A negative thermal expansion has been observed for MnGe at low-temperatures and high-pressures. The single crystal refinement has shown a discontinuous change of the atomic coordinates and Mn-Ge interatomic distances of MnGe in contrast to Mn0.1Co0.9Ge. These peculiarities of MnGe are likely to be associated with high-spin-low-spin transition. The relation between anisotropy of the coordination of Mn-atom and its magnetic moment is discussed.


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