PHONON-BATH BOTTLENECK IN NEUTRON IRRADIATED MgO
The electron spin-lattice relaxation of six samples of neutron irradiated MgO, of varying spin density, has been measured in the temperature range 1.4 to 4.2 deg K at 9.4 kMc/sec. The microwave spectrum of the samples consisted of a strong F-center line and an equally spaced sextet due to impurities in the MgO. The single phonon process is shown to be dominant, but in weak samples the recovery from the inverted state is not described by a single exponential and seems to be determined by crossrelaxation with nearby impurity lines. In strong samples the relaxation takes place with two exponentials that show a discontinuity at saturation. This behavior is attributed to a phonon-bath bottleneck in samples of large dimensions. (H.D.R.)
- Research Organization:
- Univ. of St. Andrews, Scotland
- NSA Number:
- NSA-17-008901
- OSTI ID:
- 4734790
- Journal Information:
- Phys. Letters, Journal Name: Phys. Letters Vol. Vol: 2
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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