SPIN DIFFUSION IN SINGLE CRYSTAL CAF

虽然自旋扩散众所周知发生在固体中，并且已经被广泛应用， 在过去的40年里，没有直接的研究， 通过均匀固体的自旋扩散速率的测量。 在过去的一年里，我们已经开发了一个魔术回声，梯度为基础的 记录自旋非相干散射衰减的方法 扩散 我们已经在单晶中完成了这些测量 沿着{1，1，11}和{1，1，01}方向的氟化钙。 的 自旋扩散的平行分量表现出预期的各向异性 行为 我们将减少这些测量的长度尺度， 描述介观现象的尝试。 我们还在努力 绘制出自旋扩散速率的全部各向异性，以及 探索缺陷的作用和一般多体动力学。

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.