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- W2076110089 abstract "A detailed study is made of the low-temperature dielectric relaxation peak that develops in crystalline quartz upon irradiation. A wide variety of crystals are employed: from different sources, with different purities, and with the ${mathrm{Al}}^{3+}$ impurity compensated by a selected alkali-metal ion (${mathrm{Li}}^{+}$ or ${mathrm{Na}}^{+}$) or by ${mathrm{H}}^{+}$ through the use of the technique of ``sweeping.'' A comparison is made between the dielectric peak height and the intensity of the well-known EPR spectrum due to the aluminum-hole (Al-h) center. It shows that the dielectric loss peak is due to the Al-h center, with the hole located on a ``long-bond'' oxygen atom. Analysis of the relaxation rate as a function of temperature shows that, below ensuremath{sim}6 K the relaxation takes place by a one-phonon tunneling process, while above this temperature a multiphonon process occurs. While the relaxation time in the one-phonon regime is unique, the relaxation spectrum and the mean relaxation time in the multiphonon regime are sample dependent, due to phonon scattering by crystal defects." @default.
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- W2076110089 date "1988-04-15" @default.
- W2076110089 modified "2023-09-25" @default.
- W2076110089 title "Dielectric relaxation of the aluminum-hole center inα-quartz: An example of phonon-assisted tunneling" @default.
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- W2076110089 doi "https://doi.org/10.1103/physrevb.37.7070" @default.
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