4f-shell configuration of Yb in InP studied by electron spin resonance
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We have performed electron spin resonance (ESR) measurements on Yb-doped n-type and p-type InP layers epitaxially grown by metalorganic chemical vapor deposition. ESR spectra of Yb3 + (4f13) were observed in both n-type and p-type samples. However, the ESR intensity of Yb3 + (4f13) for n-type samples was found to be much lower than that for p-type samples. This suggests that most Yb ions in Yb-doped n-type InP are in the Yb2 + (4f14) state rather than in the Yb3 + (4f13) state. Thus an electron captured by the trap level formed by Yb in the band gap of InP is not located outside the Yb 4f shell as reported previously, but accommodated in the Yb 4f shell.
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