Valkovskiy G A, Yashina E G, Dyadkin V A, Tsvyashchenko A V, Fomicheva L N, Bykov M, Bykova E, Dubrovinsky L, Yu Chernyshov D, Grigoriev S V
Saint Petersburg State University, 7/9 Universitetskaya nab., 199034 Saint-Petersburg, Russia.
J Phys Condens Matter. 2017 Jan 6;29(8):085401. doi: 10.1088/1361-648X/aa5477.
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 Co Ge and Mn Fe 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 MnCoGe. 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.
高达50吉帕压力下的单晶同步辐射衍射表明，与MnCoGe和MnFeGe固溶体相比，MnGe在结构性质和可压缩性方面存在本质差异。在低温和高压下观察到MnGe存在负热膨胀。单晶细化表明，与MnCoGe相比，MnGe的原子坐标和Mn-Ge原子间距离发生了不连续变化。MnGe的这些特性可能与高自旋-低自旋转变有关。讨论了Mn原子配位各向异性与其磁矩之间的关系。
