Electron-spin-lattice relaxation in Yb sup 3+ -doped silicate glass
- Department of Physics, University of Illinois at Urbana-Champaign, Urbana, IL (USA)
Relaxation rates of Yb{sup 3+} ions incorporated in low concentrations into a host silicate glass have been measured using a pulse saturation and recovery technique at 9.5 GHz over the temperature range 1.5--7.0 K. Compared with similar measurements made on crystalline material, the temperature dependence of the recovery rates for the two-phonon Raman process is anomalously weak ({ital T}{sup 6} instead of {ital T}{sup 9}). This anomaly suggests the need to modify the Debye density of states. Fractal models have been suggested for the thermal properties of glasses and for similarly anomalous spin-relaxation behavior in proteins. This model is discussed as well as other models of phonon localization in glasses. An estimate for the localization frequency or crossover frequency between extended and localized phonon regimes can be extracted from fits of the data from the sample with the lowest Yb concentration.
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 5976028
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:16; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
CHARGED PARTICLES
ELECTRON SPIN RESONANCE
FREQUENCY RANGE
GHZ RANGE
GHZ RANGE 01-100
GLASS
IONS
MAGNETIC RESONANCE
MATHEMATICAL MODELS
OXYGEN COMPOUNDS
PHONONS
PULSES
QUASI PARTICLES
RAMAN EFFECT
RELAXATION
RESONANCE
SILICATES
SILICON COMPOUNDS
SPIN-LATTICE RELAXATION
ULTRALOW TEMPERATURE
YTTERBIUM IONS