Abstract
We investigate the excitation spectrum and spin conductivity in square lattice antiferromagnets by nonlinear spin-wave theory. We have found that the excitation spectrum have a rotonlike minimum at about 3/4 of the saturation field. The «roton» appears and softens rapidly to zero as a function of the magnetic field as a result of the especially strong three-magnon interactions. For the spin conductivity, it becomes clear that a two-magnon sideband appears for sufficiently strong three-magnon interactions.
Original language | English |
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Article number | 012116 |
Journal | Journal of Physics: Conference Series |
Volume | 592 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2014 |
ASJC Scopus subject areas
- Physics and Astronomy(all)