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Chemical disorder effects in transport and magnetic properties of perovskite manganite

Published online by Cambridge University Press:  01 April 2005

Subhayan Biswas ,
Sandip Chatterjee ,
P. Chatterjee ,
A.K. Nigam  and
S.K. De
Subhayan Biswas
Affiliation:
Department of Materials Science, Indian Association for the Cultivation of Science, Calcutta 700 032, India
Sandip Chatterjee
Affiliation:
Tata Institute of Fundamental Research, Mumbai, 400005, India
P. Chatterjee
Affiliation:
Department of Physics, Vivekananda Mahavidyalaya, Hoogly 712405, West Bengal, India
A.K. Nigam
Affiliation:
Tata Institute of Fundamental Research, Mumbai 400005, India
S.K. De
Affiliation:
Department of Materials Science, Indian Association for the Cultivation of Science, Calcutta 700 032, India
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Abstract

The dependence of the novel properties observed in colossal magnetoresistance (CMR) materials, other than average ionic radii 〈rA〉 and Mn valence ratio (Mn3+/Mn4+), was investigated through examination of the transport and magnetic properties of Pr0.65(Ca0.7Sr0.3)0.35MnO3, La0.123Pr0.527(Ca0.8Sr0.2)0.35MnO3, and Pr0.65(Ca0.866Ba0.134)0.35MnO3. The average ionic radii 〈rA〉 and valence ratio of all three samples have been kept equal. The results of this investigation indicate a more intense role of the nature of individual A-site cation and the lattice mismatch. A remarkably large magnetoresistance of the order of 108 at moderate magnetic field has been observed for Ba-doped sample.

Keywords

Electrical propertiesMagnetic propertiesX-ray diffraction (XRD)
Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 813 - 817
Copyright
Copyright © Materials Research Society 2005

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Footnotes

a)

Present address: Department of Physics, Government College of Engineering and Textile Technology, Serampore 712201, West-Bengal, India.

References

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