受挫反铁磁自旋链体系LiCu/sub 2/O/sub 2/的毫米波ESR测量

Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004. Pub Date : 2004-01-01 DOI:10.1109/ICIMW.2004.1422126

T. Fujita, S. Mitsudo, G. Goda, T. Idehara, M. Motokawa, A. Bush, A. Vasiliev

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摘要

对受挫反铁磁自旋链体系LiCu/sub 2/O/sub 2/进行了高磁场下的毫米波ESR测量。该体系被认为是二聚体液态，在23k时坍缩为反铁磁有序跃迁。在二聚体的液态和有序态均观察到ESR光谱的吸收。有序态ESR谱线宽和共振场表现出单调的温度依赖性，这可能表明不存在另一组在9 K以下提出的额外有序态。在4 K时，频率依赖在220 GHz的有序状态下进行。在g=2的共振场中实现了不同寻常的特征。这一特征不同于简单的反铁磁共振。

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Millimeter wave ESR measurements in the frustrated antiferromagnetic spin chain system LiCu/sub 2/O/sub 2/

Millimeter wave ESR measurements were performed in high magnetic field on the frustrated antiferromagnetic spin chain system LiCu/sub 2/O/sub 2/. This system has been thought to be a dimer liquid state, which collapses into an antiferromagnetic order transition at 23 K. The absorptions in the ESR spectra were observed both in the dimer liquid state and the ordered state. The line width and resonance field of the ESR spectra in the ordered state shows monotonical temperature dependence, which may indicate the absence of the additional ordered state below 9 K proposed by the other group. The frequency dependence at 4 K were performed in the ordered state up to 220 GHz. Unusual features were realized which crosses the resonance field of the g=2. This feature differs from the one in the simple antiferromagnetic resonance.

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Infrared and Millimeter Waves, Conference Digest of the 2004 Joint 29th International Conference on 2004 and 12th International Conference on Terahertz Electronics, 2004.

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