Photosensitive Spin Resonance of Fe^<3+> in CdS

概要

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The electron spin resonance spectrum of Fe^<3+> in hexagonal CdS has been studied at X-band. The spectrum is explained in terms of the usual spin Hamiltonian with the following parameters: g=2.018±0.O02,a=(96±2)×10^<-4>cm^<-1>, D=(-49±2)x10^<-4>cm^<-1>, F=(-3±2)xlO^<-4>cm^<-1>, at 1.5°K. The resonance signal is observed in as-grown crystals under irradiation with band-gap light and also in heat-treated samples without illumination at liquid helium temperatures. The signal is enhanced by 950mμ radiation. Light in the region around 650mμ and also of 1.2〜2μ causes quenching of the signal. The 650mμ quenching bands consist of two bands of 630mμ (1.97eV) and 680mμ (1.82eV), which correspond to the electron excitation from the bonding level(1_2^b) to the non-bonding one (e^n). The 950mμ enhancement is due to the hole transfer from Cd vacancy to Fe^<2+> via the valence band. The 1.2〜2μ quenching arises from the recombination of electrons released from electron traps with holes at Fe^<3+>. The observed positive g-shift can be explained by Watanabe's theory of the g-shift in which electron transfer from ligands to Fe^<3+> through spin-orbit interaction is taken into account. The ESR signal is also observed at 78°K in a heat-treated sample.
社団法人日本物理学会の論文
1966-05-05