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