Doping-induced temperature evolution of a helicoidal spin structure in the MnGe compound

E. V. Altynbaev, A. S. Sukhanov, S. A. Siegfried, V. A. Dyadkin, E. V. Moskvin, D. Menzel, A. Heinemann, A. Schreyer, L. N. Fomicheva, A. V. Tsvyashenko, S. V. Grigoriev

Результат исследований: Научные публикации в периодических изданияхстатья

2 Цитирования (Scopus)

Выдержка

The helicoidal magnetic structure of a MnGe compound doped with 25% Fe is studied by means of small-angle neutron scattering in a wide temperature range of 10–300 K. Analysis of the scattering-function profile demonstrates that magnetic structures inherent to both pure MnGe and its doped compounds are unstable. The doping of manganese monogermanide is revealed to lead to higher destabilization of the magnetic system. In passing from MnGe to Mn0.75Fe0.25Ge, the magnetic-ordering temperature TN decreases from 130 to 95 K, respectively. It is demonstrated that, at temperatures close to 0 K, the intensity of the contribution to scattering from stable spin helices decreases and the intensity of scattering by spin helix fluctuations increases with increasing impurity-metal concentration. An increased intensity of anomalous scattering caused by spin excitations existing in the system is observed. Helicoidal fluctuations and spin excitations corresponding to low temperatures indicate the quantum nature of the instability in the doped compound. However, MnGe doping with Fe atoms has no influence on the compound’s magnetic properties at temperatures of higher than TN. The temperature range of short-range ferromagnetic correlations is independent of concentrations and is restricted by temperatures T ranging from 175 to 300 K.

Язык оригиналаанглийский
Страницы (с-по)777-782
Число страниц6
ЖурналJournal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques
Том10
Номер выпуска4
DOI
СостояниеОпубликовано - 1 июл 2016

Отпечаток

Doping (additives)
Scattering
Magnetic structure
Temperature
Manganese
Neutron scattering
Magnetization
Magnetic properties
Metals
Impurities
Atoms

Предметные области Scopus

  • Поверхности, слои и пленки

Цитировать

Altynbaev, E. V. ; Sukhanov, A. S. ; Siegfried, S. A. ; Dyadkin, V. A. ; Moskvin, E. V. ; Menzel, D. ; Heinemann, A. ; Schreyer, A. ; Fomicheva, L. N. ; Tsvyashenko, A. V. ; Grigoriev, S. V. / Doping-induced temperature evolution of a helicoidal spin structure in the MnGe compound. В: Journal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques. 2016 ; Том 10, № 4. стр. 777-782.
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abstract = "The helicoidal magnetic structure of a MnGe compound doped with 25{\%} Fe is studied by means of small-angle neutron scattering in a wide temperature range of 10–300 K. Analysis of the scattering-function profile demonstrates that magnetic structures inherent to both pure MnGe and its doped compounds are unstable. The doping of manganese monogermanide is revealed to lead to higher destabilization of the magnetic system. In passing from MnGe to Mn0.75Fe0.25Ge, the magnetic-ordering temperature TN decreases from 130 to 95 K, respectively. It is demonstrated that, at temperatures close to 0 K, the intensity of the contribution to scattering from stable spin helices decreases and the intensity of scattering by spin helix fluctuations increases with increasing impurity-metal concentration. An increased intensity of anomalous scattering caused by spin excitations existing in the system is observed. Helicoidal fluctuations and spin excitations corresponding to low temperatures indicate the quantum nature of the instability in the doped compound. However, MnGe doping with Fe atoms has no influence on the compound’s magnetic properties at temperatures of higher than TN. The temperature range of short-range ferromagnetic correlations is independent of concentrations and is restricted by temperatures T ranging from 175 to 300 K.",
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Doping-induced temperature evolution of a helicoidal spin structure in the MnGe compound. / Altynbaev, E. V.; Sukhanov, A. S.; Siegfried, S. A.; Dyadkin, V. A.; Moskvin, E. V.; Menzel, D.; Heinemann, A.; Schreyer, A.; Fomicheva, L. N.; Tsvyashenko, A. V.; Grigoriev, S. V.

В: Journal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques, Том 10, № 4, 01.07.2016, стр. 777-782.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Doping-induced temperature evolution of a helicoidal spin structure in the MnGe compound

AU - Altynbaev, E. V.

AU - Sukhanov, A. S.

AU - Siegfried, S. A.

AU - Dyadkin, V. A.

AU - Moskvin, E. V.

AU - Menzel, D.

AU - Heinemann, A.

AU - Schreyer, A.

AU - Fomicheva, L. N.

AU - Tsvyashenko, A. V.

AU - Grigoriev, S. V.

PY - 2016/7/1

Y1 - 2016/7/1

N2 - The helicoidal magnetic structure of a MnGe compound doped with 25% Fe is studied by means of small-angle neutron scattering in a wide temperature range of 10–300 K. Analysis of the scattering-function profile demonstrates that magnetic structures inherent to both pure MnGe and its doped compounds are unstable. The doping of manganese monogermanide is revealed to lead to higher destabilization of the magnetic system. In passing from MnGe to Mn0.75Fe0.25Ge, the magnetic-ordering temperature TN decreases from 130 to 95 K, respectively. It is demonstrated that, at temperatures close to 0 K, the intensity of the contribution to scattering from stable spin helices decreases and the intensity of scattering by spin helix fluctuations increases with increasing impurity-metal concentration. An increased intensity of anomalous scattering caused by spin excitations existing in the system is observed. Helicoidal fluctuations and spin excitations corresponding to low temperatures indicate the quantum nature of the instability in the doped compound. However, MnGe doping with Fe atoms has no influence on the compound’s magnetic properties at temperatures of higher than TN. The temperature range of short-range ferromagnetic correlations is independent of concentrations and is restricted by temperatures T ranging from 175 to 300 K.

AB - The helicoidal magnetic structure of a MnGe compound doped with 25% Fe is studied by means of small-angle neutron scattering in a wide temperature range of 10–300 K. Analysis of the scattering-function profile demonstrates that magnetic structures inherent to both pure MnGe and its doped compounds are unstable. The doping of manganese monogermanide is revealed to lead to higher destabilization of the magnetic system. In passing from MnGe to Mn0.75Fe0.25Ge, the magnetic-ordering temperature TN decreases from 130 to 95 K, respectively. It is demonstrated that, at temperatures close to 0 K, the intensity of the contribution to scattering from stable spin helices decreases and the intensity of scattering by spin helix fluctuations increases with increasing impurity-metal concentration. An increased intensity of anomalous scattering caused by spin excitations existing in the system is observed. Helicoidal fluctuations and spin excitations corresponding to low temperatures indicate the quantum nature of the instability in the doped compound. However, MnGe doping with Fe atoms has no influence on the compound’s magnetic properties at temperatures of higher than TN. The temperature range of short-range ferromagnetic correlations is independent of concentrations and is restricted by temperatures T ranging from 175 to 300 K.

KW - helicoidal spin structure

KW - magnetic-ordering temperature

KW - manganese germanide

KW - small-angle neutron scattering

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U2 - 10.1134/S1027451016040224

DO - 10.1134/S1027451016040224

M3 - Article

AN - SCOPUS:84983078716

VL - 10

SP - 777

EP - 782

JO - Journal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques

JF - Journal of Surface Investigation X-Ray, Synchrotron and Neutron Techniques

SN - 1027-4510

IS - 4

ER -