Rotons and spin transport in square lattice antiferromagnets in magnetic fields

Yurika Kubo; Susumu Kurihara

doi:10.1088/1742-6596/592/1/012116

Rotons and spin transport in square lattice antiferromagnets in magnetic fields

Yurika Kubo, Susumu Kurihara

Research output: Contribution to journal › Article › peer-review

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	https://doi.org/10.1088/1742-6596/592/1/012116
Publication status	Published - 2014

ASJC Scopus subject areas

Physics and Astronomy(all)

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