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

G A Valkovskiy; E G Yashina; V A Dyadkin; A V Tsvyashchenko; L N Fomicheva; M Bykov; E Bykova; L Dubrovinsky; D Yu Chernyshov; S V Grigoriev

doi:10.1088/1361-648X/aa5477

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

J Phys Condens Matter. 2017 Jan 6;29(8):085401. doi: 10.1088/1361-648X/aa5477.

Authors

G A Valkovskiy¹, E G Yashina, V A Dyadkin, A V Tsvyashchenko, L N Fomicheva, M Bykov, E Bykova, L Dubrovinsky, D Yu Chernyshov, S V Grigoriev

Affiliation

¹ Saint Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint-Petersburg, Russia.

PMID: 28060772
DOI: 10.1088/1361-648X/aa5477

Abstract

Single crystal synchrotron diffraction for pressures up to 50 GPa has revealed an essential difference in structural properties and compressibility of MnGe compared with Mn_1-x Co _x Ge and Mn_1-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 Mn_0.1Co_0.9Ge. 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.