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Effects of Chromium Ion Implantation on the Magneto-Transport Properties of La0.7Ca0.3MnO3 Thin Films

Published online by Cambridge University Press:  10 February 2011

P. S. I. P. N. De Silva ,
N. Malde ,
A. K. M. A. Hossain ,
L. F. Cohen ,
K. A. Thomas ,
R. Chater ,
J. D. Macmanus-Driscoll ,
T. J. Tate ,
N. D. Mathur  and
M. G. Blamire
...Show all authors
P. S. I. P. N. De Silva
Affiliation:
Blackett Laboratory, Imperial College, Prince Consort Rd, London, SW7 2BZ, UK.
N. Malde
Affiliation:
Blackett Laboratory, Imperial College, Prince Consort Rd, London, SW7 2BZ, UK.
A. K. M. A. Hossain
Affiliation:
Blackett Laboratory, Imperial College, Prince Consort Rd, London, SW7 2BZ, UK.
L. F. Cohen
Affiliation:
Blackett Laboratory, Imperial College, Prince Consort Rd, London, SW7 2BZ, UK.
K. A. Thomas
Affiliation:
Materials Department, Imperial College, Prince Consort Rd, London, SW7 2BP, UK.
R. Chater
Affiliation:
Materials Department, Imperial College, Prince Consort Rd, London, SW7 2BP, UK.
J. D. Macmanus-Driscoll
Affiliation:
Materials Department, Imperial College, Prince Consort Rd, London, SW7 2BP, UK.
T. J. Tate
Affiliation:
Depatment of Electrical Engineering, Imperial College, Prince Consort Rd, London, SW7 2BT, UK.
N. D. Mathur
Affiliation:
Materials Department, University of Cambridge, CB2 3QZ, UK.
M. G. Blamire
Affiliation:
Materials Department, University of Cambridge, CB2 3QZ, UK.
J. E. Evetts
Affiliation:
Materials Department, University of Cambridge, CB2 3QZ, UK.
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Abstract

Thin films of colossal magnetoresistance material La0.7Ca0.3MnO3 were implanted with different fluence 200keV Cr ions. Resistivity measurements in zero and applied fields of up to 8T were made in order to determine the effects of the implanted magnetic ions on the magnetoresistance (MR). As the Cr fluence was increased, the resistivity increased and the metal-insulator transition (MI) temperature was suppressed to values below the experimentally accessible temperature range as a result of oxygen loss and the creation of defects. However, for the highest fluence of 5×1015 ions/cm2, a re-entrant metal-insulator type transition was observed. Furthermore a significant improvement in the low field MR was observed for fields less than 500mT. These results are interpreted in terms of substitution of Cr ions onto Mn sites and the creation of a magnetically inhomogeneous material and the influence of oxygen deficiency.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 323
Copyright
Copyright © Materials Research Society 1998

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References

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