Self-trapped electrons in lithium tantalate
Abstract
The electron spin resonance spectrum of Ta 4+ ions has been investigated in LiTaO 3. These defects were produced either by irradiating as-grown crystals with X-rays or by optically bleaching crystals that had been previously reduced. In both cases, the Ta 4+ ions were stable only at temperatures near or below 77 K. The g and hyperfine matrix parameters for the Ta 4+ spectrum are g‖ = 1.503, g⊥ = 1.172, A‖ = ∼0, and A⊥ = 699 MHz. These parameters describe a 5d 1 electron on the tantalum ion, and we conclude that the defect represents a “self-trapped” electron at the normal Ta 5+ site.
- Publication:
-
Physics Letters A
- Pub Date:
- May 1986
- DOI:
- 10.1016/0375-9601(86)90244-6
- Bibcode:
- 1986PhLA..116...81S