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Journal Articles

Electron-positron momentum distributions associated with isolated silicon vacancies in 3C-SiC

Kawasuso, Atsuo; Yoshikawa, Masahito; Ito, Hisayoshi; Chiba, Toshinobu*; Higuchi, Takatoshi*; Betsuyaku, Kiyoshi*; Redmann, F.*; Krause-Rehberg, R.*

Physical Review B, 72(4), p.045204_1 - 045204_6, 2005/07

 Times Cited Count:15 Percentile:55.49(Materials Science, Multidisciplinary)

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 CDB spectrum increased and decreased in low and high momentum regions, respectively. These fetures were explained by the theoretical calculation considering silicon vacancies. The center region of 2D-ACAR spectra became isotropic after iradiation, while the overall anisotropies extending within the Jones zone were conserved suggesting that isolated silicon vacancies have the tetrahedral symmetry as expected from the previous electron spin resonance study.

Journal Articles

Angular correlation of annihilation radiation associated with vacancy defects in electron-irradiated 6$$H$$ SiC

Kawasuso, Atsuo; Chiba, Toshinobu*; Higuchi, Takatoshi*

Physical Review B, 71(19), p.193204_1 - 193204_4, 2005/05

 Times Cited Count:15 Percentile:55.49(Materials Science, Multidisciplinary)

Electron-positron momentum distributions associated with vacancy defects in 6H SiC after irradiation with 2 MeV electrons and annealing at 1000$$^{circ}C$$ have been studied using angular correlation of annihilation radiation (ACAR) measurements. It was confirmed that the above vacancy defects have dangling bonds along the c-axis and the rotational symmetry around it. The first principles calculation suggests that the vacancy defects are attributable to either carbon-vacancy-carbon-antisites complexes or silicon-vacancy-nitrogen pairs, while isolated carbon vacancies, silicon vacancies and nearest neighbor divacancies are ruled out.

Journal Articles

Polytype-dependent vacancy annealing studied by positron annihilation

Kawasuso, Atsuo; Yoshikawa, Masahito; Maekawa, Masaki; Ito, Hisayoshi; Chiba, Toshinobu*; Redmann, F.*; Rehberg, R. K.*; Weidner, M.*; Frank, T.*; Pensl, G.*

Materials Science Forum, 433-436, p.477 - 480, 2003/08

no abstracts in English

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