Low-Frequency Fluctuations in S = 1 Heisenberg Antiferromagnetic Chains: Nuclear Spin Relaxation in High Field in Ni(C2H8N2)2NO2(ClO4) (NENP)
Low-Frequency Fluctuations in S = 1 Heisenberg Antiferromagnetic Chains: Nuclear Spin Relaxation in High Field in Ni(C2H8N2)2NO2(ClO4) (NENP)
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S = 1 海森堡反铁磁链的低频波动：Ni(C2H8N2)2NO2(ClO4) (NENP) 高场中的核自旋弛豫
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
J. Renard
中科院分区：
文献类型：
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作者：
P. Gaveau;J. Boucher;L. Regnault;J. Renard
质子弛豫率 1/T1 在 NENP 中测量为温度 (2 T 40 K) 和场 (1 H 8 T) 的函数。给出了 1/T1 的定量分析，这证实了 Affleck 描述场对 Haldane 自旋系统激发光谱的影响的最新理论。还表明，施加磁场会导致波动减慢，并且当接近非磁性-磁性转变时会出现“异常”。通过假设量子能隙变软可以很好地解释这种异常现象。
The proton relaxation rate 1/T1 is measured in NENP as a function of both temperature (2 T 40 K) and field (1 H 8 T). A quantitative analysis of 1/T1 is given, which confirms a recent theory by Affleck describing the effects of a field on the excitation spectrum of a Haldane spin system. It is also shown that the application of a field results in a slowing-down of the fluctuations and that an "anomaly" occurs when the nonmagnetic-magnetic transition is approached. This anomaly is well interpreted by assuming a softening of the quantum energy gap.