Positive muons in single crystal sodium fluoride: A simple spin system
Positive muons in single crystal sodium fluoride: A simple spin system
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单晶氟化钠中的正μ介子：简单的自旋系统
DOI：
10.1007/bf02394973
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发表时间：
1986
影响因子：
--
通讯作者：
M. Celio
中科院分区：
文献类型：
--
作者：
D. R. Harshman;M. Celio
本文报道了在15±0.2K时，正μ子（μ ~+）在氟化钠单晶中的弛豫。在这个温度下，μ+被认为是静态的，并且观察到的μ+自旋极化的时间依赖性被认为在后期偏离了熟悉的Kubo-Toyabe形式。具体来说，这些数据在长时间尾部表现出振荡，这归因于μ+和相邻自旋之间的超精细跃迁。这些数据与精确量子力学计算的定量比较表明，大部分时间依赖性可以通过仅考虑与第一壳层的相互作用来解释（即，两个氟核和两个钠核），并且强烈地表明μ介子占据了沿着轴的位置<110>，在两个氟核之间的中间。
We report on the relaxation of positive muons (μ+) stopped in a single crystal of sodium fluoride at 15±0.2K. At this temperature theμ+ is believed to be static, and the observed time dependence of theμ+ spin polarization is seen to deviate from the familiar Kubo-Toyabe form at late times. Specifically these data exhibit oscillations in the long time tail, which are attributed to hyperfine transitions between theμ+ and neighboring spins. Quantitative comparison of these data to exact quantum mechanical calculations indicates that most of the time dependence can be explained by considering only interactions with the first shell (i.e., two fluorine and two sodium nuclei), and suggests strongly that the muon occupies a site along the <110> axis, midway between two fluorine nuclei.