Nuclear magnetic resonance linewidth and spin diffusion in 29Si isotopically controlled silicon
Nuclear magnetic resonance linewidth and spin diffusion in 29Si isotopically controlled silicon
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DOI：
10.1103/physrevb.78.153201
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发表时间：
2008-10-01
影响因子：
3.7
通讯作者：
Vlasenko, Leonid S.
中科院分区：
文献类型：
--
作者：
Hayashi, Hiroshi;Itoh, Kohei M.;Vlasenko, Leonid S.
核磁共振（NMR）的研究进行了n型硅单晶含有Si-29同位素丰度f范围从1.2%到99.2%。利用动态核极化（DNP）方法，从显著增强的Si-29 NMR信号的线宽确定了核自旋扩散系数D。Si-29 NMR谱线宽度至少在f <10%时与f成线性关系，当f> 50%时与f（1/2）关系接近成比例。用于DNP的磷原子之间的估计Si-29核自旋扩散时间T-sd比磷周围的Si-29核的核极化时间T-1（p）短十倍以上。因此，在DNP实验中实现了“快速自旋扩散”的机制。
A nuclear magnetic resonance (NMR) study was performed with n-type silicon single crystals containing Si-29 isotope abundance f ranges from 1.2% to 99.2%. The nuclear spin diffusion coefficient D has been determined from the linewidth of significantly enhanced Si-29 NMR signals utilizing a developed dynamic nuclear polarization (DNP) method. The Si-29 NMR linewidth depends linearly on f, at least when f < 10%, and approaches proportional to f(1/2) dependence when f>50%. The estimated Si-29 nuclear spin diffusion time T-sd between phosphorus atoms used for DNP is more than ten times shorter than the nuclear polarization time T-1(p) of Si-29 nuclei around phosphorus. Therefore, the regime of "rapid spin diffusion" is realized in the DNP experiments.