Phys. Rev. Lett. 71, 573–576 (1993)Spin-lattice relaxation: Non-Bloembergen-Purcell-Pound behavior by structural disorder and Coulomb interactionsReceived 9 April 1993; published in the issue dated 26 July 1993 We study, by Monte Carlo simulation, the spin lattice relaxation rate 1/T1(ω,T) caused by diffusing ions in disordered structures. We show that both disorder and Coulomb interactions are essential to obtain the typical non-Bloembergen-Purcell-Pound behavior of 1/T1. The dependence of 1/T1 upon frequency ω and temperature T can be described by the simple scaling form 1/T1=ω-1f(ωτ). We find that the NMR correlation time τ is more highly activated than the conductivity relaxation time τσ, which is in agreement with very recent experimental results. © 1993 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.71.573
DOI:
10.1103/PhysRevLett.71.573
PACS:
66.30.Dn, 76.60.Es, 77.22.Gm
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