Low-Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains
Low-Temperature Electron Spin Resonance Theory for Half-Integer Spin Antiferromagnetic Chains
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半整数自旋反铁磁链的低温电子自旋共振理论
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
I. Affleck
中科院分区：
文献类型：
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作者：
M. Oshikawa;I. Affleck
利用场论方法，避免了以往的近似，发展了半整数自旋反铁磁链的低温（T）电子自旋共振（ESR）理论。它是比较实验上的铜苯甲酸盐。幂律预测的线宽展宽由于各种类型的各向异性。在T -> 0时，在某些情况下出现零宽度吸收峰。在T<.76K时观察到的苯甲酸铜的第二个ESR峰并不像先前所声称的那样指示Neel级，而是对应于sine-Gordon“呼吸者”激发。
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.