Abstract
We investigated a Pt–Pt pair in Si by electron spin resonance (ESR) measurement. Two kinds of ESR spectra from Pt–Pt pairs which had been already reported were not detected. However, we observed other ESR spectrum of Pt–Pt pair. The ESR spectrum showed the hyperfine structure corresponding to two equivalent Pt atoms. The anisotropic g-tensor obtained by analyzing the angular dependence of the ESR signals indicated the orthorhombic ( C 2 v ) symmetry with the g-values of g x = 2.1 1 , g y = 2.3 1 , g z = 2.0 9 . The g z axis was along [0 0 1] direction. The g y and g z axes were along [1 1 0] and [ 1 ¯ 1 0 ] directions, respectively. The ESR spectrum of Pt–Pt pair was observed in the sample only under illumination. This suggests that a change in the charge state of Pt–Pt pair is caused by carrier excitation.
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