Model of Photoinduced Disaccommodation in Oxygen-deficient Yttrium Iron Garnet

抄録

A model for disaccommodation in single crystals of yttrium iron garnet (YIG) irradiated with white light is proposed. Only oxygen vacancies are considered to be the origin of triple peaks of disaccommodation, DA, around 130K (DA(I)), 200K (DA(II)) and 300K (DA(III)). Taking account of the number of electrons trapped in oxygen vacancy, mechanisms of DA in the three divisions are explained. The model is confirmed by the irradiation dependence of DA and the thermal hysteresis of DA(I) and DA(II).