Proton-spin-lattice relaxation in the antiferromagnetic state of CsMnCl 3 .2H 2 O
Proton-spin-lattice relaxation in the antiferromagnetic state of CsMnCl 3 .2H 2 O
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CsMnCl 3 .2H 2 O反铁磁态的质子自旋晶格弛豫
DOI：
10.1103/physrevb.12.5325
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发表时间：
1975
影响因子：
3.7
通讯作者：
T. Neef
中科院分区：
文献类型：
--
作者：
H. Nishihara;W. D. Jonge;T. Neef
在1.1 ~ 3.9K的温度范围内，测量了近一维Heisenberg系统CsMnCl 3· 2 H2O中反铁磁态质子的自旋-晶格弛豫时间.从两个非等效质子的弛豫速率的比值与计算的比值的比较，可以得出结论，在低温下，两个磁振子过程占主导地位，在高温下，交换增强的三个磁振子过程。这些贡献的定量计算，没有小k近似的限制，在文献中提供的交换常数的值的基础上，给出了一个公平的协议与实验结果。弛豫时间对链间耦合非常敏感，对实验数据的拟合表明，链间耦合约为链内耦合的（5±1）%。
The spin-lattice relaxation times of protons in the nearly one-dimensional Heisenberg system CsMn Cl 3· 2 H 2 O were measured between 1.1 and 3.9 K in the antiferromagnetic state. From the comparison of the ratio of the relaxation rates of two nonequivalent protons with the calculated ratio, it was concluded that the two-magnon process dominates at low temperatures and the exchange-enhanced three-magnon process at high temperatures. A quantitative calculation of these contributions, without the restriction of a small-k approximation, based on the values for the exchange constants available in the literature, gives a fair agreement with the experimental results. The relaxation time is very sensitive to the interchain coupling and a fitting procedure to our experimental data yields an interchain coupling of (5±1)% of the intrachain coupling.