Analysis of magnetic-resonance signals from mixed lattices with application to the center in proton glass
Klymachyov, A. Xu, R. Wandelt, A. Kahol, Pawan K.
Klymachyov, A.
Xu, R.
Wandelt, A.
Kahol, Pawan K.
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1996-03-01
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Klymachyov, A., Xu, R., Wandelt, A., Kahol, P., & Dalal, N. (1996). Analysis of magnetic-resonance signals from mixed lattices with application to the $\mathrmAsO_4^4\mathrm\ensuremath-$ center in the $\mathrmRb_1\mathrm\ensuremath-\mathitx$($\mathrmNH_4$$)_\mathitx$$\mathrmH_2$$\mathrmPO_4$ proton glass. Phys. Rev. B, 53, 6123–6128.
Abstract
Electron paramagnetic resonance (EPR) signals of the (Formula presented) radical embedded in the ferroelectric-antiferroelectric mixed lattice (Formula presented)((Formula presented)(Formula presented)(Formula presented)(Formula presented), the so-called proton glass, exhibit unusual features: the line centers shift concomitant with an overall broadening, but not as predicted by standard motional narrowing models. Earlier studies have interpreted this phenomenon as implying a direct evidence for the existence of a “fast” ferroelectric-antiferroelectric exchange process. In contrast, the current work presents a phenomenological model that ascribes the observed signal to the resultant of a statistical average of hyperfine splittings over the various possible near-neighbor interactions, with little contribution from motional averaging or exchange processes. The methodology presented yields information on the range of interactions in a mixed lattice, and should be applicable to other related cases such as NMR analysis of mixed systems. © 1996 The American Physical Society.
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American Physical Society
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Physical Review B - Condensed Matter and Materials Physics
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1098-0121