is a relatively new addition to the family of colossal magnetoresistive manganites, in which the cerium ion is believed to be in the state. In this article, we report the magnetotransport properties of laser ablated films on and the effect of varying the ambient oxygen pressure during growth and the film thickness. We observe that the transport and magnetic properties of the film depend on the oxygen pressure, surface morphology, film thickness, and epitaxial strain. The films were characterized by x-ray diffraction using a four-circle goniometer. We observe an increase in the metal-insulator transition temperature with decreasing oxygen pressure. This is in direct contrast to the oxygen pressure dependence of films and suggests the electron doped nature of the system. With decreasing film thickness we observe an increase in the metal-insulator transition temperature. This is associated with a compression of the unit cell in the a-b plane due to epitaxial strain. On codoping with 50% Ca at the Ce site, the system is driven into an insulating state suggesting that the electrons generated by are compensated by the holes generated by thus making the average valence at the rare-earth site 3+ as in the parent material
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15 November 1999
Research Article|
November 15 1999
Transport and magnetic properties of laser ablated films on
P. Raychaudhuri;
P. Raychaudhuri
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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S. Mukherjee;
S. Mukherjee
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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A. K. Nigam;
A. K. Nigam
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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J. John;
J. John
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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U. D. Vaisnav;
U. D. Vaisnav
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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R. Pinto;
R. Pinto
Department of Condensed Matter and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Rd., Colaba, Mumbai-400005, India
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P. Mandal
P. Mandal
Saha Institute of Nuclear Physics, Block-AF, Sector I, Salt Lake, Calcutta-700064, India
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J. Appl. Phys. 86, 5718–5725 (1999)
Article history
Received:
June 04 1999
Accepted:
August 11 1999
Citation
P. Raychaudhuri, S. Mukherjee, A. K. Nigam, J. John, U. D. Vaisnav, R. Pinto, P. Mandal; Transport and magnetic properties of laser ablated films on . J. Appl. Phys. 15 November 1999; 86 (10): 5718–5725. https://doi.org/10.1063/1.371584
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