Chiral fluctuations in triangular antiferromagnets at T≪ TN
Abstract
Chiral fluctuations in triangular antiferromagnets (TAFs) at T≪TN are studied theoretically. The case of a ferromagnetic interaction along the c axis (which is directed perpendicular to the plane of the lattice), Dzyaloshinskii-Moriya interaction D‖c and a weak magnetic field H‖c , is considered in detail. Previously, this model has been proposed to describe quantum TAF CsCuCl3 . Expressions for dynamical chirality (DC) are derived within the linear spin-wave approximation. In contrast to nonfrustrated 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.
- Publication:
-
Physical Review B
- Pub Date:
- April 2005
- DOI:
- 10.1103/PhysRevB.71.144408
- arXiv:
- arXiv:cond-mat/0507720
- Bibcode:
- 2005PhRvB..71n4408S
- Keywords:
-
- 75.40.Gb;
- 75.25.+z;
- 75.50.Ee;
- Dynamic properties;
- Spin arrangements in magnetically ordered materials;
- Antiferromagnetics;
- Strongly Correlated Electrons
- E-Print:
- Phys. Rev. B 71, 144408 (2005)