Magnetic Phase Transition in MnSi Based on the First Principle Calculations of Electronic Structure and Spin Fluctuation Theory

2019 ◽  
Vol 289 ◽  
pp. 198-204
Author(s):  
Aleksandr Povzner ◽  
Tatyana A. Nogovitsyna ◽  
Arkadij G. Volkov ◽  
Tagir Nuretdinov
Keyword(s):  
Phase Transition ◽  
Electronic Structure ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Spin Fluctuation ◽  
Fluctuation Theory ◽  
Ministry Of Education ◽  
Spin Correlations ◽  
The Russian Federation ◽  
Good Agreement

Based on the spin-fluctuation theory and LSDA + U + SO-calculations of the electronic structure, the spin states arising in the region of the magnetic phase transition in the helicoidal ferromagnet MnSi are studied. Within the framework of the stated model of the electronic structure, a temperature dependence of the homogeneous magnetic susceptibility is obtained near the temperature of the magnetic phase transition, which is in good agreement with experiment. At the temperature of the transition to the paramagnetic state, the left chirality vanishes, and spin correlations arise with a radius equal to the length of the spin helix, which then decreases with temperature. The results were obtained within the framework of the assignment of the Ministry of Education and Science of the Russian Federation, contract 3.9521.2017 / 8.9

Spin Fluctuation and Magnetic Phase Transition in Itinerant Heavy Electron System Ce(Ru1-xRhx)2Si2(x=0, 0.03 and 0.05)

1998 ◽  
Vol 67 (7) ◽  
pp. 2484-2487 ◽  
Author(s):  
Yoshikazu Tabata ◽  
Toshifumi Taniguchi ◽  
Masugu Sato ◽  
Shuzo Kawarazaki ◽  
Yoshihito Miyako
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Spin Fluctuation ◽  
Electron System ◽  
Heavy Electron

Electronic structure and magnetic phase transition in MnSi

2017 ◽  
Vol 59 (7) ◽  
pp. 1285-1290 ◽  
Author(s):  
A. A. Povzner ◽  
A. G. Volkov ◽  
T. A. Nogovitsyna
Keyword(s):  
Phase Transition ◽  
Electronic Structure ◽  
Magnetic Phase Transition ◽  
Magnetic Phase

scholarly journals Магнитный фазовый переход в MnSi на основе LSDA+U +SO-расчетов электронной структуры и спин-флуктуационной теории

2018 ◽  
Vol 60 (10) ◽  
pp. 1882
Author(s):  
А.Г. Волков ◽  
Т.А. Ноговицына ◽  
А.А. Повзнер ◽  
Т.М. Нуретдинов
Keyword(s):  
Phase Transition ◽  
Magnetic Susceptibility ◽  
Magnetic Phase Transition ◽  
Magnetic State ◽  
Magnetic Phase ◽  
Spin Fluctuation ◽  
Paramagnetic State ◽  
Local Magnetization ◽  
Left And Right ◽  
Weight Coefficients

AbstractSpin states appearing near the magnetic phase transition in helicoidal ferromagnet MnSi are studied on the basis of the spin-fluctuation theory and the LSDA + U + SO calculations of the electronic structure. The temperature dependence of the uniform magnetic susceptibility is calculated near the magnetic phase transition temperature, and the result agrees well with the experiment. Spin correlators corresponding to various solutions of the equation of magnetic state are determined in the region of the magnetic phase transition expanded in temperature. It is shown that, in this region, a helicoidal short-range order appears in the form of the superposition of left and right spin spirals with stochastic weight coefficients. It is shown that the magnetic susceptibility divergences on the helicoid wave vector at the temperature of disappearance of local magnetization and during the transition to the paramagnetic state.

scholarly journals Study of physical properties of a ferrimagnetic spinel Cu1.5Mn1.5O4: spin dynamics, magnetocaloric effect and critical behavior

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25664-25676
Author(s):  
Abir Hadded ◽  
Jalel Massoudi ◽  
Sirine Gharbi ◽  
Essebti Dhahri ◽  
A. Tozri ◽  
...  
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Physical Properties ◽  
Magnetocaloric Effect ◽  
Phase Transition Temperature ◽  
Magnetic Phase Transition ◽  
Critical Behavior ◽  
Magnetic Phase ◽  
Spin Dynamics ◽  
Critical Behaviour

The present work reports a detailed study of the spin dynamics, magnetocaloric effect and critical behaviour near the magnetic phase transition temperature, of a ferrimagnetic spinel Cu1.5Mn1.5O4.

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