Thermal expansion and compressibility of monogermanides of 3d-metals
G. A. Valkovskiy (1), E. V. Altynbaev (1, 2), M. D. Kuchugura (2),, E. G. Yashina (2), V. A. Dyadkin (3), A. V. Tsvyashchenko (4), V. A. Sidorov, (4), L. N. Fomicheva (4), M. Bykov (5), E. Bykova (5, 6), L. Dubrovinsky (6),, D. Yu. Chernyshov (7), S. V. Grigoriev (1
TL;DR
This study investigates the thermal and pressure responses of monogermanides of 3d-metals, revealing anomalous behaviors in MnGe and related solid solutions, linked to spin fluctuations and Mn spin state instability.
Contribution
It provides new insights into the anomalous thermal and pressure behaviors of MnGe and related compounds, highlighting the role of spin fluctuations and Mn spin state instability.
Findings
Anomalous thermal expansion and compressibility observed in MnGe.
Similar but less pronounced effects in Mn-Co-Ge and Mn-Fe-Ge solid solutions.
Spin density fluctuations and Mn spin state instability are potential causes.
Abstract
Synchrotron diffraction as a function of temperature and pressure, specific heat, magnetic susceptibility and small-angle neutron scattering experiments have revealed an anomalous response of MnGe. Similar but less pronounced behavior has also been observed in MnCoGe and MnFeGe solid solutions. Spin density fluctuations and Mn spin state instability are discussed as possible candidates for the observed effects.
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