Saturation of the density of states of tunneling systems in defective crystalline neutron-irradiated quartz
The variation of the longitudinal velocity of sound has been measured in a neutron-irradiated quartz sample exposed to a moderate dose of 4.7 x 10/sup 19/ n/cm/sup 2/ (Egreater than or equal to0.3 MeV), at low temperatures for three different frequencies. A surprisingly high density of tunneling systems was found, equal to the value in neutron-irradiated vitreous silica. This result is especially interesting in view of the fact that this sample was found to be still to a large extent crystalline, whereas neutron-irradiated vitreous silica is fully amorphous. The observation of the saturation of the density of states of tunneling systems in a still largely crystalline sample is further related to studies of the damage induced by neutrons in quartz. It is suggested that the tunneling systems partly reside at the interfaces of the ..cap alpha../sub 1/-..cap alpha../sub 2/ domains present in neutron-irradiated quartz.
- Research Organization:
- Laboratorium voor Vaste Stof- en Hoge Druk-Fysika, Departement of Natuurkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B-3030 Leuven, Belgium
- OSTI ID:
- 6843847
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:9; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360605* -- Materials-- Radiation Effects
CHALCOGENIDES
CRYSTALS
DOMAIN STRUCTURE
ENERGY-LEVEL DENSITY
FREQUENCY RANGE
INTERFACES
MHZ RANGE
MHZ RANGE 100-1000
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL RADIATION EFFECTS
QUARTZ
RADIATION EFFECTS
SATURATION
SILICON COMPOUNDS
SILICON OXIDES
TEMPERATURE DEPENDENCE
TUNNEL EFFECT
ULTRALOW TEMPERATURE