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

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

1999-04-15

arxiv.org/abs/cond-mat/9904199v1

Phys. Rev. Lett. 82, 5136 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, REVTEX, 3 PostScript figures embedded in text

Scientific paper

10.1103/PhysRevLett.82.5136

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.

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