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 |
|---|---|
| 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)
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Kubo, Y., & Kurihara, S. (2014). Rotons and spin transport in square lattice antiferromagnets in magnetic fields. Journal of Physics: Conference Series, 592(1), [012116]. https://doi.org/10.1088/1742-6596/592/1/012116