SPIN-LATTICE RELAXATION - NON-BLOEMBERGEN-PURCELL-POUND BEHAVIOR BY STRUCTURAL DISORDER AND COULOMB INTERACTIONS

Authors
MEYER M MAASS P BUNDE A
Citation
M. Meyer et al., SPIN-LATTICE RELAXATION - NON-BLOEMBERGEN-PURCELL-POUND BEHAVIOR BY STRUCTURAL DISORDER AND COULOMB INTERACTIONS, Physical review letters, 71(4), 1993, pp. 573-576
Citations number
39
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
71
Issue
4
Year of publication
1993
Pages
573 - 576
Database
ISI
SICI code
0031-9007(1993)71:4<573:SR-NBB>2.0.ZU;2-#
Abstract
We study, by Monte Carlo simulation, the spin lattice relaxation rate 1/T1(omega,T) caused by diffusing ions in disordered structures. We sh ow that both disorder and Coulomb interactions are essential to obtain the typical non-Bloembergen-Purcell-Pound behavior of 1/T1. The depen dence of 1/T1 upon frequency omega and temperature T can be described by the simple scaling form 1/T1 = omega-1 f(omegatau). We find that th e NMR correlation time tau is more highly activated than the conductiv ity relaxation time tau(sigma), which is in agreement with very recent experimental results.