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Reduced dimensionality effects on phonon transport
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Image of FIG. 1.
FIG. 1.

Low temperature EPR spectra of Czochralski grown samples (upper spectra in both cases) and SCS oxyorthosilicates with 1% Ce (lower spectra) for (a) LSO and (b) YSO.

Image of FIG. 2.
FIG. 2.

The simulated EPR spectra of Ce (upper trace in each graph) and the measured spectra (lower trace in each panel) for the various oxyorthosilicates are shown (a) bulk LSO, (b) SCS LSO, (c) bulk YSO, and (d) SCS YSO.

Image of FIG. 3.
FIG. 3.

EPR spectra measured at 15 K of nanophosphor YSO:Ce for various Ce doping levels as indicated.

Image of FIG. 4.
FIG. 4.

The percentages of the total Ce population for the and sites for SCS YSO as a function of Ce doping level.

Image of FIG. 5.
FIG. 5.

Temperature dependent EPR spectra of the Ce resonance for SCS YSO with 1% Ce.

Image of FIG. 6.
FIG. 6.

(a) Pure Lorentzian , (b) pure Gaussian , and (c) total linewidths for bulk LSO, bulk YSO, nanophospor LSO, and nanophosphor YSO derived from fitting the Ce resonance with Eq. (1). The solid lines are guides for the eye only.

Image of FIG. 7.
FIG. 7.

The percentage of the total linewidth that is Lorentzian as a function of temperature.


Generic image for table
Table I.

Simulations of the EPR spectra resulted in the given and values ( was not detected).

Generic image for table
Table II.

The temperature-dependent EPR spectra were fit with a Voigt function [Eq. (1)] to obtain the Gaussian and Lorentzian linewidths. The Gaussian linewidths then allowed us to determine the ILs. The Lorentzian linewidths were converted to lifetimes and were fit to obtain the relaxation constant (A), the Orbach constant (C), and the energy splittings for both the typical case [Eq. (3)] and the phonon bottleneck case [Eq. (7), where possible].


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reduced dimensionality effects on phonon transport