Temperature dependence of the electron-spin-resonance spectrum of the chain-end S=1/2 modes in an S=1 antiferromagnetic chain.
Temperature dependence of the electron-spin-resonance spectrum of the chain-end S=1/2 modes in an S=1 antiferromagnetic chain.
复制标题
S=1 反铁磁链中链端 S=1/2 模式的电子自旋共振谱的温度依赖性。
DOI：
10.1103/physrevb.45.5299
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
Affleck
中科院分区：
文献类型：
--
作者：
Mitra;Halperin;Affleck
最近在含有特定杂质的Ni（C2 H8 N2）2NO 2ClO 4（简称NENP）的低温ESR测量中观察到了S=1/2的自由度，这一自由度被预言发生在S=1的类海森堡反铁磁链的末端。信号被发现随温度迅速下降，在温度远低于Half-gap。我们在这里提出了一个理论分析的ESR信号的损失，由于存在的热自旋激发链，这至少可以定性地解释实验。1992年美国物理学会
The S=1/2 degrees of freedom, which have been predicted to occur at the ends of an S=1 Heisenberg-like antiferromagnetic chain, have been observed recently in low-temperature ESR measurements of Ni(C2H8N2)2NO2ClO4 (abbreviated NENP) containing selected impurities. The signal was found to decrease rapidly with temperature, at temperatures well below the Haldane gap. We present here a theoretical analysis of the loss of ESR signal due to the presence of thermal spin excitations on the chain, which can at least qualitatively explain the experiment. © 1992 The American Physical Society.