Photoconductivity in Disordered Nickel-Oxide Films

Photoconductivity measurements in the infrared and visible spectral regions have been made on disordered NiO Films. The result shows a prominent peak at the energy of 0.23 eV, coinciding with the one in the infrared absorption, which is believed to be a spin-excited state due to the antiferromagnetic ordering. We propose a model to explain the observation. © 1969 The American Physical Society.