Physical property of Pr_<0.65>Ca_<0.35>MnO_3 thin film deposited by the radio frequency magnetron sputtering

概要

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A photo-induced effect in Pr_<0.65>Ca_<0.35>MnO_3 (PCMO) powder sample is reported with the electron paramagnetic resonance (EPR) and the x-ray diffraction study. This photo-induced effect occurs in the charge-ordered (CO) state associated with the canted antiferromagnetic (AF) spin order. The PCMO thin films prepared by a radio frequency magnetron sputtering method on the SrTiO_3 (100) single crystal were studied compared to the powder sample focusing on the optimization of the photo-induced effect. An annealing process at 1000℃ in O_2 gas decreases the oxygen stoichiometry and enhances the crystallization. Better texture of crystal structure of the thin film can obtain with higher deposition temperature. The best deposition temperature is 850℃. The present PCMO thin films have different physical property. The dR/dT of the PCMO thin film does not show clear sign of the onset of the second-order CO transition. A spontaneous magnetization appears below 70K. The irreversible hysteresis between the FC (C) and ZFC grows with a decrease in temperature remarkably below 55K which is shifted lower temperature compared with the powder sample.
弓削商船高等専門学校の論文
2002-02-28