Dynamics of an anisotropic spin dimer system in a strong magnetic field

Kolezhuk, A. K.*; Glazkov, V. N.*; Tanaka, Hidekazu*; Osawa, Akira

Recently measured high-field ESR spectra of the spin dimer material TlCuCl are described within the framework of an effective field theory. A good agreement between the theory and experiment is achieved, for all geometries and in a wide field range, under the assumption of a weak anisotropy of the interdimer as well as intradimer exchange interaction.