In muon-spin-rotation experiments, positive muons are implanted in the material and come to rest in the unrelaxed host lattice. The formation of the final configuration requires a lattice relaxation which does not occur instantly. The present paper is concerned with the transition from the initial stopping state to the final muon configuration. We identify the often observed fast relaxing signal in muon experiments (e.g., in several oxides studied recently) with the transition state in this conversion process. This state is paramagnetic with a small hyperfine interaction (in the order of MHz) which fluctuates and averages to almost zero. Because of its apparent diamagnetic frequency behavior, the fast signal was in the past assigned to ${\mathrm{Mu}}^{+}$ or ${\mathrm{Mu}}^{-}$. We present evidence that this state is actually paramagnetic. The model presented in this paper is of importance for the interpretation of past and future $\mu \mathrm{SR}$ measurements.

中文翻译：

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过渡态在μ子植入中的作用

在μ子自旋旋转实验中，将正性μ子植入材料中，并停留在未松弛的宿主晶格中。最终构型的形成需要晶格弛豫，这不会立即发生。本文涉及从初始停止状态到最终μ子配置的过渡。我们确定了在μ子实验中经常观察到的快速弛豫信号（例如，在最近研究的几种氧化物中），并且在此转换过程中具有过渡态。这种状态是顺磁性的，具有很小的超精细相互作用（约为MHz），该相互作用波动并平均为几乎为零。由于其明显的反磁频率行为，过去曾将快速信号分配给${亩}^{+}$ 或者 ${亩}^{-}$。我们提供证据表明这种状态实际上是顺磁性的。本文介绍的模型对于解释过去和未来非常重要$\mu \mathrm{SR}$ 测量。