Two-dimensional Heisenberg antiferromagnet in a transverse field
arXiv:cond-mat/0602033 · doi:10.1103/PhysRevB.73.144405
Abstract
We investigate the magnetic reorientation in a two-dimensional anisotropic antiferromagnet due to a transverse magnetic field. Using a many-body Green's function approach, we show that the magnetization component perpendicular to the applied field (and along the easy-axis of the antiferromagnet) initially increases with increasing field strength. We show that this unexpected result arises from the suppression of quantum and thermal fluctuations in the antiferromagnet. Above the Néel temperature, this effect leads to a reappearance of a magnetic moment along the easy-axis.
References in corpus (4)
- Quantum Monte Carlo study of S=1/2 weakly-anisotropic antiferromagnets on the square lattice
- Theory of field induced spin reorientation transition in thin Heisenberg films
- Anisotropy effects on the magnetic excitations of a ferromagnetic monolayer below and above the Curie temperature
- Two-dimensional anisotropic Heisenberg antiferromagnet in a field