Spin relaxation and diffusion in quasi-two-dimensional organic metals: The bis(ethylenedithiolo)tetrathiafulvalene compounds beta -(BEDT-TTF)2X (X=I
Spin relaxation and diffusion in quasi-two-dimensional organic metals: The bis(ethylenedithiolo)tetrathiafulvalene compounds beta -(BEDT-TTF)2X (X=I
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准二维有机金属中的自旋弛豫和扩散：双(亚乙基二硫醇)四硫富瓦烯化合物 beta -(BEDT-TTF)2X (X=I
DOI：
10.1103/physrevb.35.6554
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
Kinoshita
中科院分区：
文献类型：
--
作者：
Sugano;Saito;Kinoshita
在 4 至 300 K 范围内检查了准二维有机金属 β-(BEDT-TTF) 2 X [BEDT-TTF 是双 (亚乙基二硫醇) 四硫富瓦烯、C 10 H 8 S 8，X 是 I 3 或 IBr 2] 的电子自旋共振 (ESR) 线宽和线形。两种盐的线宽表现出一致的近线性温度依赖性具有金属行为。由IBr 2 盐的线宽得出的自旋弛豫时间T 2 总是比I 3 盐的线宽长，而自旋扩散时间T D 彼此非常接近。发现在两种盐中，T D 在20 K以下与T 2 相当，而在100 K以上T D 远大于T 2 。从g值和线宽的角度依赖性分析发现，g张量的主方向与线宽张量的主方向略有不同。这表明这些有机金属的 ESR 线宽不会简单地受艾略特自旋轨道耦合机制的支配。
The electron-spin-resonance (ESR) linewidth and line shape for the quasi-two-dimensional organic metals β-(BEDT-TTF) 2 X [BEDT-TTF is bis (ethylenedithiolo) tetrathiafulvalene, C 10 H 8 S 8, and X is I 3 or IBr 2] are examined over the range from 4 to 300 K. The linewidth of both salts exhibits nearly linear temperature dependence consistent with metallic behavior. The spin-relaxation time T 2 derived from the linewidth of the IBr 2 salt is always longer than that of the I 3 salt, whereas the spin-diffusion times T D are very close to each other. It is found that in both salts, T D is comparable to T 2 below 20 K, while T D is much larger than T 2 above 100 K. From the analysis of the angular dependence of the g value and linewidth, it is found that the principal directions of the g tensor are slightly different from those of the linewidth tensor. This suggests that the ESR linewidth of these organic metals would not be simply dominated by Elliott’s spin-orbit coupling mechanism.