Structural and thermal stability of B20-type high-pressure phases FeGe and MnGe

Камаева, Л. В.; Chtchelkatchev, N. M.; Suslov, Alexey; Magnitskaya, M. V.; Tsvyashchenko, A. V.

doi:10.1016/j.jallcom.2021.161565

Cited by 6 publications

(5 citation statements)

References 67 publications

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“…The shape and magnitude of this peak, which is two times the difference between the formation enthalpies of these two structures, indicate a more complex process of transition from non-equilibrium to equilibrium state. This is in contrast to our previous DSC studies of B20type FeGe and MnGe [21], where a similar but very weak exothermic shoulder was shown to represent a transition from the metastable B20 phase to only a single equilibrium phase: hexagonal B35 for FeGe and hypothetical tetragonal for MnGe.…”

Section: Resultscontrasting

confidence: 99%

“…In contrast to this, most TM monogermanides, for example, based on CoGe, MnGe, RhGe, etc can only be prepared under high pressure-high temperature conditions, which means that sometimes it can be difficult to obtain good-quality samples. In recent years, new representatives of this class have been synthesised at high pressure and studied in many aspects [12,13,[19][20][21][22]24].…”

Section: Introductionmentioning

confidence: 99%

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Structural transformations and thermal stability of RhGe synthesized under high temperature and pressure

Камаева¹,

Magnitskaya²,

Suslov³

et al. 2022

J. Phys.: Condens. Matter

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Here, we study B20-type RhGe, a representative of a class of non-centrosymmetric monosilicides and monogermanides, which possess unique topological and magnetic properties important for many possible applications. The stability and phase transitions of the non-equilibrium B20-RhGe phase that can only be obtained under high pressure, are investigated theoretically using ab initio calculations and experimentally by means of dierential scanning calorimetry. For RhGe and, for comparison, for its analogue RhSi, we conducted an evolutionary search for low-energy polymorphic modications at zero temperature and then performed simulations of their behavior at nite temperatures. The (P; T) conditions of stability for the found polymorphs are determined. Our calorimetric studies on high-pressure-synthesized RhGe samples allowed us to reveal peculiarities in thermal stability and heating-induced phase transformations. X-ray diffraction analysis and microstructure analysis of the samples were carried out before and after the heating. We also determined the specic heat from calorimetric measurements and compared the results with our calculations in the quasi-harmonic approximation.

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structural transformations and thermal stability of RhGe synthesized under high temperature and pressure

Камаева¹,

Magnitskaya²,

Suslov³

et al. 2022

J. Phys.: Condens. Matter

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“…However, this symmetry-breaking distortion from B20 is quite small and only visible as a very For pure FeGe, the calculation yields a moment of ∼ 1 µ B /Fe, which compares well with the experiments and previous calculations [26,27,28,29].…”

Section: Measurement Results and Theoretical Analysissupporting

confidence: 89%

Split of the magnetic and crystallographic states in Fe1−Rh Ge

Skanchenko

Altynbaev²,

Sidorov³

et al. 2023

Journal of Alloys and Compounds

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“…For pure FeGe, the calculation yields a moment of ∼ 1 µ B /Fe, which compares well with the experiments and previous calculations [26,27,28,29].…”

Section: Measurement Results and Theoretical Analysissupporting

confidence: 89%

Split of the magnetic and crystallographic states in Fe$_{1-x}$Rh$_{x}$Ge

Skanchenko¹,

Altynbaev²,

Sidorov³

et al. 2022

Preprint

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We report on a comprehensive experimental and theoretical study of Fe 1−x Rh x Ge compounds, within the entire concentration range x ∈ [0.0 − 1.0], using X-Ray diffraction, small-angle neutron scattering, magnetometry and theoretical calculations. While FeGe and RhGe are single phase helimagnet and unconventional superconductor, respectively, an internal splitting of the crystallographic and magnetic states is found for intermediate compositions x ∈ [0.2 − 0.9]. A theoretical analysis of the stability of the two detected phases, together with the experimental data, indicate that this splitting preserves a common space group and occurs within single crystallites. Despite their apparent similarity, these two phases however display different magnetic structures, with distinct ferro-and helimagnetic character.

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Structural and thermal stability of B20-type high-pressure phases FeGe and MnGe

Cited by 6 publications

References 67 publications

Structural transformations and thermal stability of RhGe synthesized under high temperature and pressure

Structural transformations and thermal stability of RhGe synthesized under high temperature and pressure

Split of the magnetic and crystallographic states in Fe1−Rh Ge

Split of the magnetic and crystallographic states in Fe$_{1-x}$Rh$_{x}$Ge

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