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28 March 2024
 
  » arxiv » 1512.0235

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Finite-Temperature Properties of Three-Dimensional Classical Chiral Helimagnets
Misako Shinozaki ; Shintaro Hoshino ; Yusuke Masaki ; Jun-ichiro Kishine ; Yusuke Kato ;
Date 1 Dec 2015
AbstractA three-dimensional chiral helimagnet is analyzed using a mean-field (MF) analysis and a classical Monte Carlo (MC) simulation at finite temperatures. We consider a Hamiltonian containing Heisenberg exchange and uni-axial Dzyaloshinskii-Moriya interactions on a simple cubic lattice. Magnetization curves calculated by the MF theory are qualitatively consistent with those observed in experiments. A comparison between lattice and continuum models clarifies the region where the continuum approximation can be applied. By combining the MF theory with the classical MC method, it is also clarified that results are quantitatively much improved by including spin correlations inside the layer perpendicular to the helical axis. On the basis of our simple model, interaction parameters in $CrNb_3S_6$ are estimated. These values of exchange interactions justify a physical picture that the spins are strongly coupled in the two-dimensional layer and are weakly interacted with those in the helical chain.
Source arXiv, 1512.0235
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