Spin-echo decay in a stochastic field environment | |
Article | |
关键词: TRANSVERSE RELAXATION; VORTEX DYNAMICS; Y-89 NMR; YBA2CU3O7; | |
DOI : 10.1103/PhysRevB.60.9279 | |
来源: SCIE |
【 摘 要 】
We derive a general formalism with which it is possible to obtain the time (tau) dependence of the echo size for a spin in a stochastic field environment. Our model is based on strong collisions. We examine in detail two examples. Tn the first one the field distribution has a finite second moment, and in the second one (a Lorentzian) it does not. We find that the echo decay in the first case is exponential in tau(3) as tau-->0, and in the second case can be approximated by the phenomenological expression exp(-[2 tau/T-2](beta)) with 1
【 授权许可】
Free