Mossbauer studies of single crystal Pr1/3Sr2/3FeO3

Single crystal Pr1/3Sr2/3FeO3 was synthesized by using thr floating zone me thod and the rc relation of magnetic properties and charge ordering transit ion with lattice dynamics was systematically investigated. Mossbauer spectr a of Pr1/3Sr2/3FeO3 were taken at various temperatures ranging from 20 It t o room temperature. The charge disproportionation, in which iron with valen ce stales Fe3+ and Fe5+ was found in a ratio of 2:1, was detected in Pr1/3S r2/3FeO3 below 190+/-3 Ti. Iron with valence state Fe4+ coexisted in Pr1/3S r2/3FeO3 at and above 150 ii, and its ratio increased from 13 to 66 % with increasing temperature. This result means that charge-ordered and -disorder ed phases co-exist in Pr1/3Sr2/3FeO3.