Instability of antiferromagnetic magnons in strong fields

Дата и время публикации : 1998-08-10T17:18:57Z

Авторы публикации и институты :
M. E. Zhitomirsky (Department of Physics, University of Toronto, L. D. Landau Institute for Theoretical Physics)
A. L. Chernyshev (Department of Physics, Queen’s University)

Ссылка на журнал-издание: Phys. Rev. Lett. 82, 4536 (1999).
Коментарии к cтатье: RevTeX, 4 pages, 3 figures, accepted to PRL
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: We predict that spin-waves in an ordered quantum antiferromagnet (AFM) in a strong magnetic field become unstable with respect to spontaneous two-magnon decays. At zero temperature, the instability occurs between the threshold field $H^*$ and the saturation field $H_c$. As an example, we investigate the high-field dynamics of a Heisenberg antiferromagnet on a square lattice and show that the single-magnon branch of the spectrum disappears in the most part of the Brillouin zone.

Category: Physics