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Epitaxial Growth and Physical Properties of La1-xCaxMnO3-δ Thin Films on MgO(001) Substrates

Published online by Cambridge University Press:  15 February 2011

J. Y. Gu ,
K. H. Kim ,
T. W. NOH ,
Jeong Soo Lee ,
Young Woo Jeong  and
W. Jo
J. Y. Gu
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
K. H. Kim
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
T. W. NOH
Affiliation:
Department of Physics and Condensed Matter Research Institute, Seoul National University, Seoul 151–742, Korea
Jeong Soo Lee
Affiliation:
LG Electronics Research Center, 16 Woomyeon-dong, Seocho-gu, Seoul 137–140, Korea
Young Woo Jeong
Affiliation:
LG Electronics Research Center, 16 Woomyeon-dong, Seocho-gu, Seoul 137–140, Korea
W. Jo
Affiliation:
LG Electronics Research Center, 16 Woomyeon-dong, Seocho-gu, Seoul 137–140, Korea
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Abstract

Perovskite La1-xCaxMnO3-δ (LCMO) thin films with a wide range of x, i.e., 0.0 ≤ x ≤ 0.6, were deposited on MgO(001) substrates using a pulsed laser deposition (PLD) technique. Epitaxial La0.7Ca0.3MnO3-δ/MgO thin films were able to be grown under a condition such as 1.5 ∼ 2.1 J/cm2 of a laser fluence, 650 ∼ 750 °C of a substrate temperature, and 100 ∼ 300 mtorr of an oxygen pressure. X-ray pole figures and electron diffraction pattern showed that the LCMO films were grown epitaxially on MgO(001). Rutherford Backscattering Spectroscopy measurements investigated that the epitaxial LCMO films have compositions similar to those of targets, demonstrating the PLD is a useful technique to get films with complicated chemical compositions. Various physical properties, including resistance, R, magnetoresistance, ΔR/R(H=0) ≡ (R(H)-R(0))/R(O), and magnetization, M(T), were measured. The LCMO thin films with 0.2 ≤ x ≤ 0.5 had both semiconductor-metal and ferromagnetic ordering transitions, whose temperatures are located close to each other. These physical properties were explained in terms of the magnetic polaron model.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 401: Symposium G – Epitaxial Oxide Thin Films II , 1995 , 461
Copyright
Copyright © Materials Research Society 1996

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