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|Title:||Theoretical and experimental study of high-pressure synthesized B20-type compounds Mn1-x(Co,Rh)xGe|
|Authors:||Chtchelkatchev, N. M.|
Magnitskaya, M. V.
Sidorov, V. A.
Fomicheva, L. N.
Petrova, A. E.
Tsvyashchenko, A. V.
|Citation:||Theoretical and experimental study of high-pressure synthesized B20-type compounds Mn1-x(Co,Rh)xGe / N. M. Chtchelkatchev, M. V. Magnitskaya, V. A. Sidorov et al. // Pure and Applied Chemistry. — 2019. — Vol. 91. — Iss. 6. — P. 941-955.|
|Abstract:||The search and exploration of new materials not found in nature is one of modern trends in pure and applied chemistry. In the present work, we report on experimental and ab initio density-functional study of the high-pressure-synthesized series of compounds Mn1-x(Co,Rh)xGe. These high-pressure phases remain metastable at normal conditions, therewith they preserve their inherent noncentrosymmetric B20-type structure and chiral magnetism. Of particular interest in these two isovalent systems is the comparative analysis of the effect of 3d (Co) and 4d (Rh) substitution for Mn, since the 3d orbitals are characterized by higher localization and electron interaction than the 4d orbitals. The behavior of Mn1-x(Co,Rh)xGe systems is traced as the concentration changes in the range 0 ≤ x ≤ 1. We applied a sensitive experimental and theoretical technique which allowed to refine the shape of the temperature dependencies of magnetic susceptibility χ(T) and thereby provide a new and detailed magnetic phase diagram of Mn1-xCoxGe. It is shown that both systems exhibit a helical magnetic ordering that very strongly depends on the composition x. However, the phase diagram of Mn1-xCoxGe differs from that of Mn1-xRhxGe in that it is characterized by coexistence of two helices in particular regions of concentrations and temperatures. © 2019 IUPAC and De Gruyter.|
HIGH PRESSURE ENGINEERING
MAGNETIC PHASE DIAGRAMS
|metadata.dc.description.sponsorship:||Acknowledgments: The authors gratefully thank S.M. Stishov for interest to this work and acknowledge valuable discussions with Yu.A. Uspenskii and I. Mirebeau. This work was supported by Russian Science Foundation: N.M.C. and M.V.M. acknowledge the support of their theoretical calculations (grant RSF 18-12-00438); V.A.S., A.E.P., and A.V.T. are grateful for support of their experimental measurements (Funder Id: http://dx.doi.org/10.13039/501100006769, grant RSF 17-12-01050). The numerical calculations were carried out using computing resources of the federal collective usage center ‘Complex for Simulation and Data Processing for Mega-science Facilities’ at NRC ‘Kurchatov Institute’ (http://ckp.nrcki.ru/) and supercomputers at Joint Supercomputer Center of Russian Academy of Sciences (http://www.jscc.ru). We also thank for access to the URAN cluster (http://parallel.uran.ru) made by the Ural Branch of Russian Academy of Sciences.|
|RSCF project card:||18-12-00438|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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