Mitra, P. P., Le Doussal, P. (1991) Long-time magnetization relaxation of spins diffusing in a random field. Physical Review B, 44 (21). pp. 12035-12038. ISSN 01631829 (ISSN)
Abstract
We study the free-induction decay and the spin-echo attenuation at long times for spins diffusing in a random magnetic field. We show that the decay of transverse magnetization in a Gaussian random longitudinal field is asymptotically M(t)t-1e-t/, where is the exponent of a self-avoiding walk. The usual result given by a cumulant expansion fails due to correlations arising from multiple self-intersections in d4. Experimental relevance of our analysis is discussed along with the question of universality and the existence of large fluctuations in finite-size systems. © 1991 The American Physical Society.
| Item Type: | Paper |
|---|---|
| Subjects: | Investigative techniques and equipment > magnetic resonance imaging physics |
| CSHL Authors: | |
| Communities: | CSHL labs > Mitra lab |
| Depositing User: | CSHL Librarian |
| Date: | 1991 |
| Date Deposited: | 02 Apr 2012 20:05 |
| Last Modified: | 10 Feb 2017 20:53 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/25858 |
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