Abstract
The magnon bound-state spectrum recently observed in the anisotropic magnetic salt · O is discussed in terms of analytic expressions. The transverse energy spectrum including the coupling to an optic phonon and the longitudinal energy spectrum are evaluated to all orders in , is the transverse anisotropy [] and is the applied magnetic field, and to second order in the transverse mean exchange [] and expressed in terms of Bessel functions. In the low-field limit the spectrum is analyzed by means of the quasicalssical method. The transverse and longitudinal intensity spectra have the form of infinite continued fractions and can be expressed in terms of Bessel functions. The low-field and zero-field limits are discussed in detail.
- Received 20 May 1974
DOI:https://doi.org/10.1103/PhysRevB.10.4000
©1974 American Physical Society