Tunneling in proton glasses: stochastic theory of NMR line shape

Dattagupta, S. ; Tadic, B. ; Pirc, R. ; Blinc, R. (1991) Tunneling in proton glasses: stochastic theory of NMR line shape Physical Review B, 44 (9). pp. 4387-4396. ISSN 0163-1829

Full text not available from this repository.

Official URL: http://prb.aps.org/abstract/PRB/v44/i9/p4387_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.44.4387


The effects of the tunneling motion of hydrogen on the NMR line shape in randomly mixed ferroelectric crystals of the type Rb1-x(NH4)xH2PO4, known as proton glasses, is studied. The line shapes are calculated for the Clauser-Blume model with use of mean-field theory applied to the infinite-range model of an Ising spin glass in a transverse field, which describes the tunneling frequency of a proton in the O-H...O bond. The interplay of tunneling and spin-glass-like ordering phenomena leads to characteristic features in the NMR, NQR, and EPR spectral line shapes. Magnetic-resonance line-shape measurements thus permit discrimination between coherent tunneling processes and classical thermally activated intrabond hopping across the potential barrier in proton glasses.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:9138
Deposited On:29 Oct 2010 11:32
Last Modified:28 May 2011 11:56

Repository Staff Only: item control page