Abstract
The paramagnetic susceptibility Kpara of CdF2:In crystals with metastable indium centers has been measured in darkness after photobleaching the crystals in visible light in the temperature interval 4–300 K. For crystals cooled in darkness to liquid-helium temperature Kpara is wholly determined by the accompanying impurity Mn2+ with magnetic moment J=5/2. Illumination of the crystals leads to the appearance of an induced signal δKpara due to the formation of centers with J=1/2. The results of the experiments indicate the absence of paramagnetism in the deep state of the indium center and its existence in the shallow (donor) state, i.e., they confirm the two-electron (negative-U) nature of the deep indium level in CdF2.
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