Dependence of transport property of sol-gel derived La(0.7)Ca(0.3)MnO(3) thin films on their thicknesses

La(0.7)Ca(0.3)MnO(3) thin films with various thicknesses were successfully fabricated on SrTiO(3) single crystal substrates via sol-gel method. X-Ray diffraction manifests that all the films have highly preferential orientation. Electrical transport measurement shows a strong impact of film thicknes...

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Bibliographic Details
Published inHong wai yu hao mi bo xue bao Vol. 33; no. 4; pp. 364 - 368
Main Authors Bu, Hai-Jun, Gao, Ju, Hu, Gu-Jin, Dai, Ning
Format Journal Article
LanguageChinese
Published 01.08.2014
Subjects
Diffraction
Film thickness
Infrared
Physical properties
Polarons
Sol gel process
Thin films
X-rays
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Summary:La(0.7)Ca(0.3)MnO(3) thin films with various thicknesses were successfully fabricated on SrTiO(3) single crystal substrates via sol-gel method. X-Ray diffraction manifests that all the films have highly preferential orientation. Electrical transport measurement shows a strong impact of film thickness on the physical properties of La(0.7)Ca(0.3)MnO(3) thin films, which can be attributed to the change of lattice structure of the films substrate induced by strain. Further study indicates that in the films with small film thicknesses, variable range hopping of small polarons is the dominant transport process at high temperatures, and in those films with larger thicknesses small polarons are the predominant charge carriers even at very low temperatures.
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ISSN:1001-9014
DOI:10.3724/SP.J.1010.2014.00364