The vacuum annealing effect on the photoinduced properties in La 0.7 Sr 0.3 MnO 3 thin film

Chin J Mater Res

2009, Vol. 23

Issue (4): 395-398 DOI:

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The vacuum annealing effect on the photoinduced properties in La _0.7 Sr _0.3 MnO ₃ thin film

TAN Xingyi; JIN Kexin; ZHAO Shenggui; CHEN Changle

Shannxi Key Laboratory of Condensed Matter Structures and Properties; School of Science; Northwestern Polytechnical University; Xi'an 710072

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TAN Xingyi JIN Kexin ZHAO Shenggui CHEN Changle. The vacuum annealing effect on the photoinduced properties in La _0.7 Sr _0.3 MnO ₃ thin film. Chin J Mater Res, 2009, 23(4): 395-398.

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Abstract

La_0.7Sr_0.3MnO₃ (LSMO) target has been prepared by a Sol–gel method and the film of LSMO with the thickness of 187 nm has been deposited on a (012)–oriented LaAlO₃substrate using the pulsed laser deposition technique. The transport and photoinduced properties of the LSMO film at different annealing conditions have been investigated. The phase transition temperature decreases and the electrical resistivity of the film increases with increasing the annealing time. Photoinduced properties show that the laser induces the increases of the electrical resistivity in the metallic phase and the reduction in the insulation phase. The photoconduction (Δρ) increases, and then decreases with increasing the annealing time. It is found that there exists the max photoconduction about 0.013 Ωcm for the sample with the 40 minutes vacuum annealing, which is attributed to double exchange interaction.

Key words: inorganic non–metallic materials rare earth doped manganite oxygen vacancy double exchange interaction photoinduced effect

Received: 27 October 2008

ZTFLH:	TB383
	O482

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Supported by the National Natural Science Foundation of China Nos50331040 and 50702046.

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