Research output: Contribution to journal › Review article › peer-review
Exotic Spin Structures in Transition-Metal Monosilicides and Monogermanides. / Altynbaev, E. V.; Chubova, N. M.; Grigoriev, S. V.
In: Crystallography Reports, Vol. 67, No. 1, 01.02.2022, p. 118-136.Research output: Contribution to journal › Review article › peer-review
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TY - JOUR
T1 - Exotic Spin Structures in Transition-Metal Monosilicides and Monogermanides
AU - Altynbaev, E. V.
AU - Chubova, N. M.
AU - Grigoriev, S. V.
N1 - Publisher Copyright: © 2022, Pleiades Publishing, Inc.
PY - 2022/2/1
Y1 - 2022/2/1
N2 - Abstract: Monosilicides and monohermanides of transition metals (e.g., MnSi) are characterized by a noncentrosymmetric structure of the B20 type, which leads to the occurrence of the Dzyaloshinski–Moriya (DM) interaction and, as a consequence, helicoidal magnetic ordering. The sign of the DM interaction determines the direction (clockwise or anticlockwise) of magnetic-helicoid twist. It is found that the type of atoms (e.g., Mn and Fe) present in a compound corresponds unambiguously to the sign of DM interaction in both silicides and germanides of transition metals. In turn, the replacement of Mn with Fe atoms in Mn1-xFexGe (and some other) solid solutions results in a flip of the magnetic system chirality. These compounds demonstrates also a complex nature of the first-order temperature phase transition (close to the second-order one), complicated by a multicomponent order parameter and accompanied by a wide range of critical helical fluctuations. The magnetic field–temperature (H–T) phase diagram demonstrates occurrence of a new phase with a skyrmion lattice structure, or A-phase, in a narrow range of fields near the phase-transition point. Application of pressure or replacement of Mn with Fe or Co atoms leads to disappearance of long-range magnetic order and occurrence of a quantum phase transition. This review contains the experimental results obtained using small-angle neutron scattering (SANS) and characterizing the magnetic properties and phase diagrams of helicoidal magnets.
AB - Abstract: Monosilicides and monohermanides of transition metals (e.g., MnSi) are characterized by a noncentrosymmetric structure of the B20 type, which leads to the occurrence of the Dzyaloshinski–Moriya (DM) interaction and, as a consequence, helicoidal magnetic ordering. The sign of the DM interaction determines the direction (clockwise or anticlockwise) of magnetic-helicoid twist. It is found that the type of atoms (e.g., Mn and Fe) present in a compound corresponds unambiguously to the sign of DM interaction in both silicides and germanides of transition metals. In turn, the replacement of Mn with Fe atoms in Mn1-xFexGe (and some other) solid solutions results in a flip of the magnetic system chirality. These compounds demonstrates also a complex nature of the first-order temperature phase transition (close to the second-order one), complicated by a multicomponent order parameter and accompanied by a wide range of critical helical fluctuations. The magnetic field–temperature (H–T) phase diagram demonstrates occurrence of a new phase with a skyrmion lattice structure, or A-phase, in a narrow range of fields near the phase-transition point. Application of pressure or replacement of Mn with Fe or Co atoms leads to disappearance of long-range magnetic order and occurrence of a quantum phase transition. This review contains the experimental results obtained using small-angle neutron scattering (SANS) and characterizing the magnetic properties and phase diagrams of helicoidal magnets.
UR - http://www.scopus.com/inward/record.url?scp=85124943835&partnerID=8YFLogxK
UR - https://www.mendeley.com/catalogue/ec3046b0-588f-3548-819f-331f7079f801/
U2 - 10.1134/s1063774522010023
DO - 10.1134/s1063774522010023
M3 - Review article
AN - SCOPUS:85124943835
VL - 67
SP - 118
EP - 136
JO - Crystallography Reports
JF - Crystallography Reports
SN - 1063-7745
IS - 1
ER -
ID: 98730965