Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.

E. Altynbaev, S.-A. Siegfried, V. Dyadkin, E. Moskvin, D. Menzel, A. Heinemann, C. Dewhurst, L. Fomicheva, A. Tsvyashchenko, S. Grigoriev

Результат исследований: Научные публикации в периодических изданияхстатья

15 Цитирования (Scopus)

Выдержка

The magnetic structure of the cubic helimagnet MnGe was studied by small-angle neutron scattering in a wide temperature range from 10 to 300 K. We show that MnGe undergoes a complex order-disorder phase transition covering more than 100 K above the critical temperature TN=(130±2) K. Moreover, the helical structure is intrinsically unstable below TN, since the profile of the reflection at kh∼2 nm−1 associated with the spin helix can be described by the sum of Gaussian and Lorentzian contributions, indicating a stable helix and spin-helix fluctuations, respectively. The Gaussian behavior determines the system at low temperature, whereas the Lorentzian is negligible. With increasing temperature, however, the Lorentzian starts to contribute and dominates at TN. The spin-helix fluctuations are accompanied by intensive spin excitations observed in small-angle neutron scattering as Q-independent scattering at Q
Язык оригиналаанглийский
Страницы (с-по)174420_1-6
ЖурналPhysical Review B - Condensed Matter and Materials Physics
Том90
Номер выпуска17
DOI
СостояниеОпубликовано - 2014

Отпечаток

Order disorder transitions
helices
Phase transitions
disorders
Neutron scattering
neutron scattering
Temperature
Magnetic structure
critical temperature
coverings
Scattering
temperature
profiles
scattering
excitation

Цитировать

Altynbaev, E. ; Siegfried, S.-A. ; Dyadkin, V. ; Moskvin, E. ; Menzel, D. ; Heinemann, A. ; Dewhurst, C. ; Fomicheva, L. ; Tsvyashchenko, A. ; Grigoriev, S. / Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition. В: Physical Review B - Condensed Matter and Materials Physics. 2014 ; Том 90, № 17. стр. 174420_1-6.
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title = "Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.",
abstract = "The magnetic structure of the cubic helimagnet MnGe was studied by small-angle neutron scattering in a wide temperature range from 10 to 300 K. We show that MnGe undergoes a complex order-disorder phase transition covering more than 100 K above the critical temperature TN=(130±2) K. Moreover, the helical structure is intrinsically unstable below TN, since the profile of the reflection at kh∼2 nm−1 associated with the spin helix can be described by the sum of Gaussian and Lorentzian contributions, indicating a stable helix and spin-helix fluctuations, respectively. The Gaussian behavior determines the system at low temperature, whereas the Lorentzian is negligible. With increasing temperature, however, the Lorentzian starts to contribute and dominates at TN. The spin-helix fluctuations are accompanied by intensive spin excitations observed in small-angle neutron scattering as Q-independent scattering at Q",
author = "E. Altynbaev and S.-A. Siegfried and V. Dyadkin and E. Moskvin and D. Menzel and A. Heinemann and C. Dewhurst and L. Fomicheva and A. Tsvyashchenko and S. Grigoriev",
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journal = "Physical Review B-Condensed Matter",
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Altynbaev, E, Siegfried, S-A, Dyadkin, V, Moskvin, E, Menzel, D, Heinemann, A, Dewhurst, C, Fomicheva, L, Tsvyashchenko, A & Grigoriev, S 2014, 'Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.', Physical Review B - Condensed Matter and Materials Physics, том. 90, № 17, стр. 174420_1-6. https://doi.org/10.1103/PhysRevB.90.174420

Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition. / Altynbaev, E.; Siegfried, S.-A.; Dyadkin, V.; Moskvin, E.; Menzel, D.; Heinemann, A.; Dewhurst, C.; Fomicheva, L.; Tsvyashchenko, A.; Grigoriev, S.

В: Physical Review B - Condensed Matter and Materials Physics, Том 90, № 17, 2014, стр. 174420_1-6.

Результат исследований: Научные публикации в периодических изданияхстатья

TY - JOUR

T1 - Intrinsic instability of the helix spin structure in MnGe and order-disorder phase transition.

AU - Altynbaev, E.

AU - Siegfried, S.-A.

AU - Dyadkin, V.

AU - Moskvin, E.

AU - Menzel, D.

AU - Heinemann, A.

AU - Dewhurst, C.

AU - Fomicheva, L.

AU - Tsvyashchenko, A.

AU - Grigoriev, S.

PY - 2014

Y1 - 2014

N2 - The magnetic structure of the cubic helimagnet MnGe was studied by small-angle neutron scattering in a wide temperature range from 10 to 300 K. We show that MnGe undergoes a complex order-disorder phase transition covering more than 100 K above the critical temperature TN=(130±2) K. Moreover, the helical structure is intrinsically unstable below TN, since the profile of the reflection at kh∼2 nm−1 associated with the spin helix can be described by the sum of Gaussian and Lorentzian contributions, indicating a stable helix and spin-helix fluctuations, respectively. The Gaussian behavior determines the system at low temperature, whereas the Lorentzian is negligible. With increasing temperature, however, the Lorentzian starts to contribute and dominates at TN. The spin-helix fluctuations are accompanied by intensive spin excitations observed in small-angle neutron scattering as Q-independent scattering at Q

AB - The magnetic structure of the cubic helimagnet MnGe was studied by small-angle neutron scattering in a wide temperature range from 10 to 300 K. We show that MnGe undergoes a complex order-disorder phase transition covering more than 100 K above the critical temperature TN=(130±2) K. Moreover, the helical structure is intrinsically unstable below TN, since the profile of the reflection at kh∼2 nm−1 associated with the spin helix can be described by the sum of Gaussian and Lorentzian contributions, indicating a stable helix and spin-helix fluctuations, respectively. The Gaussian behavior determines the system at low temperature, whereas the Lorentzian is negligible. With increasing temperature, however, the Lorentzian starts to contribute and dominates at TN. The spin-helix fluctuations are accompanied by intensive spin excitations observed in small-angle neutron scattering as Q-independent scattering at Q

U2 - 10.1103/PhysRevB.90.174420

DO - 10.1103/PhysRevB.90.174420

M3 - Article

VL - 90

SP - 174420_1-6

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

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