SPIN DIFFUSION IN SINGLE CRYSTAL CAF

而众所周知，自旋扩散发生在固体中，并且已经 在过去的40年里，到目前为止还没有直接的 测量自旋在均匀固体中的扩散速率。 在过去的一年里，我们开发了一种神奇的回声，基于梯度 记录自旋非相干散射衰减的方法 扩散。我们已经完成了这些单晶的测量 氟化钙沿{1，1，1 1和{1，1，01方向。这个 自旋扩散的平行分量显示预期的各向异性 行为。我们将在#年缩小这些测量的长度范围 一种刻画介观现象的尝试。我们也在努力 绘制出自旋扩散速率的全部各向异性，以及 探索缺陷的作用，以及一般的多体动力学。

While spin diffusion is well known to occur in solids and has been studied for the past 40 years, to date there have been no direct measurements of the spin diffusion rate through a homogeneous solid. Over the past year we have developed a magic-echo, gradient based means of recording the incoherent scattering attenuation from spin diffusion. We have completed these measurements in single crystal calcium fluoride along the { 1,1,1 1 and the { 1,1,01 directions. The parallel component of spin diffusion show the expected anisotropic behavior. We will decrease the length scale of these measurements in an attempt to characterize mesoscopic phenomena. We are also working to map out the full anisotropy of the spin diffusion rate, as well as exploring the roles of defects, and general multi-body dynamics.