Low-Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains

Masaki Oshikawa and Ian Affleck
Phys. Rev. Lett. 82, 5136 – Published 21 June 1999
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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 linewidth broadening due to various types of anisotropy. At T0, zero width absorption peaks occur in some cases. The second ESR peak in Cu benzoate, observed at T<0.76K, is argued not to indicate Néel order as previously claimed, but to correspond to a sine-Gordon “breather” excitation.

  • Received 26 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.82.5136

©1999 American Physical Society

Authors & Affiliations

Masaki Oshikawa1 and Ian Affleck2

  • 1Department of Physics, Tokyo Institute of Technology, Oh-okayama, Meguro-ku, Tokyo 152-8551, Japan
  • 2Department of Physics and Astronomy and Canadian Institute for Advanced Research, The University of British Columbia, Vancouver, British Columbia, V6T 1Z1, Canada

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Vol. 82, Iss. 25 — 21 June 1999

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