Interference of Instanton Trajectories in Quantum Tunneling for Small Particles of Real Antiferromagnets

Details Interference of Instanton Trajectories in Quantum Tunneling for Small Particles of Real Antiferromagnets Interference of Instanton Trajectories in Quantum Tunneling for Small Particles of Real Antiferromagnets

2005-01-10

arxiv.org/abs/cond-mat/0501185v1

JETP 94, 270 -- 282 (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 1 table

Scientific paper

For a two-sublattice antiferromagnet the Lagrangian is constructed taking into account Berry phase whose form is matched to the quantum-mechanical Heisenberg Hamiltonian. Tunnel effects are analyzed taking into account the crystallographic symmetry and possible types of the Dzyaloshinskii-Moriya interaction. It is shown that, when the real magnetic symmetry and the Dzyaloshinskii-Moriya interaction are taken into consideration, the effects of a destructive instanton interference and the suppression of macroscopic quantum tunneling can play an essential role. It also may lead to a periodic dependence of the ground-state level splitting on the Dzyaloshinskii-Moriya interaction constant; the magnitude of this splitting is calculated.

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