Charge-Ordered State in Pr_<0.65>Ca_<0.35>MnO_3 Thin Film Deposited by the Magnetron Sputtering

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In the Pr_<0.35>MnO_3 (PCMO) powder samples, the photo-induced effect is reported in the charge ordered (CO) state associated with the canted antiferromagnetic (CAF) spin order with the electron spin resonance (ESR) and the powder x-ray diffraction study. The PCMO thin films prepared by the radio frequency magnetron sputtering method were studied focusing on application of this photoinduced effect to industrial application such as the optical-magnetic hybrid device. Better texture of crystal structure of the thin film is obtained with decreasing the lattice mismatch and the best substrate is the LaALO_3 (100) substrates. The dR/dT for the PCMO thin film sputtered on SrTiO_3 (001) for 4 h shows clear sign of the second-order transition at T_<CO> 〜 247 K that gives an evidence for existence of the CO state. A spontaneous magnetization appears below T_<CAF> 〜 120 K and an irreversible hysteresis between the FC(C) and ZFC grows remarkably below T_<CAF> with decreasing in temperature. The ESR signal appears below T_<CAF> and spits into at least two signal lines below 80 K. Both results indicate the existence of magnetic domains with random orientation of ferromagnetic component in the CAF spin order below T_<CAF>. The ESR profiles for the present PCMO thin film shows some kind of modification with the photo injection (hv = 1.17 eV). This result possibly attribute existence of the mixing of two phase, i. e., the CO - CAF cluster and photo-induced charge-delocalize (CD)-ferromagnetic (F) cluster.
弓削商船高等専門学校の論文
2003-02-28

Charge-Ordered State in Pr_<0.65>Ca_<0.35>MnO_3 Thin Film Deposited by the Magnetron Sputtering

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