Paramagnetic susceptibility of semiconducting CdF2:In crystals: Direct evidence of the negative-U nature of the DX-like center

Paramagnetic susceptibility κpara of CdF2 crystals with bistable In centers is measured in the temperature range T=4–300 K. For crystals cooled in the dark down to liquid helium temperature, κpara is determined by the trace Mn2+ impurity. Illumination of the sample by the ultraviolet-visible light r...

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Veröffentlicht in:Applied physics letters 1997-03, Vol.70 (10), p.1272-1274
Hauptverfasser: Kazanskii, S. A., Ryskin, A. I., Romanov, V. V.
Format: Artikel
Sprache:eng
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Zusammenfassung:Paramagnetic susceptibility κpara of CdF2 crystals with bistable In centers is measured in the temperature range T=4–300 K. For crystals cooled in the dark down to liquid helium temperature, κpara is determined by the trace Mn2+ impurity. Illumination of the sample by the ultraviolet-visible light results in the appearance of the photoinduced δκpara signal due to formation of centers with the magnetic moment J=1/2. This gives a clear evidence of an absence of paramagnetism in the deep state of the bistable In center and its presence in the shallow state, i.e., proves the negative-U nature of the deep state.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.118550