Spin-wave interaction and renormalization of magnetic anisotropy in 2D antiferromagnets.
The renormalization of the magnetic anisotropy is investigated in 2D easy-axis antiferromagnets using 1/S expansion. It was shown that in the spin-wave gap Delta appears as the 1/S2 infrared divergent correction which becomes large at T>Delta and demands analysis of the full 1/S expansion. Qualitative consequences of this gap renormalization are discussed in relation to the AFR and neutron scattering experiments.
Maleyev
S V
SV
Petersburg Nuclear Physics Institute, Gatchina, St. Petersburg 188350, Russia.