Electron-positron momentum distributions associated with isolated silicon vacancies in 3C-SiC
- Advanced Science Research Center, Japan Atomic Energy Research Institute, Watanuki, 1233, Takasaki, Gunma 370-1292 (Japan)
Two-dimensional angular correlation of annihilation radiation (2D-ACAR) and coincidence Doppler broadening (CDB) of annihilation radiation measurements have been performed on electron-irradiated n-type 3C-SiC in which isolated silicon vacancies are responsible for positron trapping. After irradiation, the intensity of the CDB spectrum increased and decreased in low- and high-momentum regions, respectively. These features were explained by a theoretical calculation considering silicon vacancies. The central region of the 2D-ACAR spectra became isotropic after irradiation, while the overall anisotropies extending within the Jones zone were conserved suggesting that isolated silicon vacancies have tetrahedral symmetry, as expected from a previous electron spin resonance study.
- OSTI ID:
- 20719162
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 72, Issue 4; Other Information: DOI: 10.1103/PhysRevB.72.045204; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANGULAR CORRELATION
ANISOTROPY
ANNIHILATION
CRYSTALS
DISTRIBUTION
DOPPLER BROADENING
ELECTRON BEAMS
ELECTRON SPIN RESONANCE
ELECTRONS
EMISSION SPECTRA
IRRADIATION
POSITRONS
SEMICONDUCTOR MATERIALS
SILICON
SILICON COMPOUNDS
SYMMETRY
TRAPPING
VACANCIES
ZONES