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Epitaxial growth of dielectric CaCu3Ti4O12 thin films on (001) LaAlO3 by pulsed laser deposition

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12 Author(s)
Lin, Y. ; Texas Center for Superconductivity and Department of Physics, University of Houston, Houston, Texas 77204 ; Chen, Y.B. ; Garret, T. ; Liu, S.W.
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High dielectric CaCu3Ti4O12 (CCTO) thin films were epitaxially grown on (001) LaAlO3 (LAO) substrates by pulsed laser deposition. Microstructural studies by x-ray diffraction, pole figure measurements, and transmission electron microscopy show that the as-grown films are good single crystalline quality with an interface relationship of (001)CCTO//(001)LAO and [100]CCTO//[100]LAO. Dielectric property measurements show that the films have an extremely high dielectric constant with value of 10 000 at 1 MHz at room temperature. It is interesting to note that the twinned substrate results in the formation of twinning or dislocations inside the CCTO film. © 2002 American Institute of Physics.

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Applied Physics Letters  (Volume:81 ,  Issue: 4 )