Theory of Low Temperature Electron Spin Resonance in Half-integer Spin Antiferromagnetic Chains

Preprint

15 April 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9904199

Abstract

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 line-width broadening due to various types of anisotropy. At T -> 0, zero width absorption peaks occur in some cases. The second ESR peak in Cu benzoate, observed at T<.76K, is argued not to indicate Neel order as previously claimed, but to correspond to a sine-Gordon "breather" excitation.

Keywords

ELECTRON SPIN RESONANCE
SPIN ANTIFERROMAGNETIC
LOW TEMPERATURE
SPIN RESONANCE
HALF INTEGER
INTEGER SPIN
ESR

All Related Versions

Version 1, 1999-04-15, ArXiv
Published version: Physical Review Letters, 82 (25), 5136.

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