Spin-Fluctuation Transitions in MnSi According to Electron Paramagnetic Resonance and Neutron Scattering

The experimental data on low-temperature ( T < 40 K) neutron scattering and electron paramagnetic resonance for a helical magnet manganese monosilicide (MnSi) are analyzed. It is established that the smooth evolution of the parameters of spin fluctuations considered both in the conventional theor...

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Bibliographic Details
Published in:Doklady. a journal of the Russian Academy of Sciences. Physics 2022-10, Vol.67 (10), p.410-414
Main Author: Demishev, S. V.
Format: Article
Language:English
Subjects:
Classical Mechanics
Electron paramagnetic resonance
Low temperature
Magnetic fields
Magnets
Manganese silicide
Mathematical and Computational Physics
Neutron scattering
Neutrons
Parameters
Phase transitions
Physics
Physics and Astronomy
Resonance scattering
Theoretical
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Summary:The experimental data on low-temperature ( T < 40 K) neutron scattering and electron paramagnetic resonance for a helical magnet manganese monosilicide (MnSi) are analyzed. It is established that the smooth evolution of the parameters of spin fluctuations considered both in the conventional theory of magnetic phase transitions and in its generalization to the case of helical magnets is disturbed by the presence of spin-fluctuation transitions (SFTs) in which the amplitude of spin fluctuations and their correlation radius change sharply. In a zero magnetic field, the transition at the temperature T c = 29 K, which is usually interpreted as the transition to a helical magnetically ordered phase, is preceded by two spin-fluctuation transitions with T 1 = 32 K and T 2 = 30.5 K. In a magnetic field of B ~ 2 T at a temperature of 29 K coinciding with T c , another spin-fluctuation transition with the parameters characteristic for the SFT inside the magnetically ordered phase is discovered. It is shown that, as the temperature decreases, MnSi at T = T 1 undergoes the SFT with the appearance of helical fluctuations, while the appearance of a helical phase ( B = 0) or a spin-polarized phase ( B = 2 T) occurs at T = T 2 and is accompanied by a spin-fluctuation transition.
ISSN:1028-3358
1562-6903
DOI:10.1134/S1028335822100032