On the theory of microwave absorption by the spin-1/2 Heisenberg-Ising magnet

TL;DR

This paper provides an exact theoretical analysis of microwave absorption in the spin-1/2 Heisenberg-Ising magnet, deriving moments of susceptibility to predict resonance shifts and line widths across various conditions.

Contribution

It introduces an exact calculation of the first four moments of the susceptibility for the one-dimensional model, enabling precise predictions of resonance properties at arbitrary temperatures and fields.

Findings

Exact moments determine resonance shift and line width.

Perturbative results for small anisotropy at fixed frequency.

Explicit high-temperature formula relating line width to anisotropy.

Abstract

We analyze the problem of microwave absorption by the Heisenberg-Ising magnet in terms of shifted moments of the imaginary part of the dynamical susceptibility. When both, the Zeeman field and the wave vector of the incident microwave, are parallel to the anisotropy axis, the first four moments determine the shift of the resonance frequency and the line width in a situation where the frequency is varied for fixed Zeeman field. For the one-dimensional model we can calculate the moments exactly. This provides exact data for the resonance shift and the line width at arbitrary temperatures and magnetic fields. In current ESR experiments the Zeeman field is varied for fixed frequency. We show how in this situation the moments give perturbative results for the resonance shift and for the integrated intensity at small anisotropy as well as an explicit formula connecting the line width with the anisotropy parameter in the high-temperature limit.