Chiral fluctuations in triangular antiferromagnets at $T\ll T_N$

Abstract

Chiral fluctuations in triangular antiferromagnets (TAFs) at $T\ll T_N$ are studied theoretically. The case of a ferromagnetic interaction along c axis (which is directed perpendicular to the plane of the lattice), Dzyaloshinskii-Moriya interaction $\mathbf{D}\Vert c$ and a weak magnetic field $\mathbf{H}\Vert c$ is considered in detail. Previously, this model has been proposed to describe quantum TAF CsCuCl${}_3$. Expressions for dynamical chirality (DC) are derived within the linear spin-wave approximation. In contrast to non-frustrated antiferromagnets, DC is found to be nonzero even at $D,H=0$ in a one-domain sample. We argue that this unusual behavior stems from the fact that a ground state of XY and Heisenberg TAFs is characterized by an axial vector along which DC is directed.

References in corpus (2)

• Universality of phase transitions of frustrated antiferromagnets
• Spin chirality induced by the Dzyaloshinskii-Moriya interaction and the polarized neutron scattering

Cited by in corpus (7)

• Parity Broken Chiral Spin Dynamics in Ba${}_3$NbFe${}_3$Si${}_2$O${}_{14}$
• Magnetic chirality as probed by neutron scattering
• Spiral magnets with Dzyaloshinskii-Moriya interaction containing defect bonds
• Novel elementary excitations in spin-1/2 antiferromagnets on the triangular lattice
• Renormalization of the spin-wave spectrum in three-dimentional ferromagnets with dipolar interaction
• Chiral scattering in complex magnets
• Antiferromagnets with random vacancies and substitutional spins on the triangular lattice