Thermal fluctuations in the conical state of monoaxial helimagnets | |
Article | |
关键词: HELICOIDAL STRUCTURES; WEAK FERROMAGNETISM; ANTIFERROMAGNETS; CR1/3NBS2; CRYSTALS; | |
DOI : 10.1103/PhysRevB.98.144445 | |
来源: SCIE |
【 摘 要 】
The effect of thermal fluctuations on the phase structure of monoaxial helimagnets with external magnetic field parallel to the chiral axis is analyzed by means of a saddle point expansion of the free energy. The phase transition that separates the conical and forced ferromagnetic phases is changed to first order by the thermal fluctuations. In a purely monoaxial system the pitch of the conical state remains independent of temperature and magnetic field, as in mean-field theory, even when fluctuations are taken into account. However, in the presence of weak Dzyaloshinskii-Moriya interactions in the plane perpendicular to the chiral axis, thermal fluctuations induce a dependence of the pitch on temperature and magnetic field. This may serve to determine the nature of magnetic interactions in such systems.
【 授权许可】
Free