Low-Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains
Low-Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains
A theory of low-temperature ( $T$) electron spin resonance (ESR) in half-integer spin antiferromagnetic chains is developed using field theory methods and avoiding previous approximations. It is compared to experiments on Cu benzoate. Power laws are predicted for the linewidth broadening due to various types of anisotropy. At $T\ensuremath{\rightarrow}0$, zero …