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Influence of Mn–O bond length on carrier localization in La1−x (Ca,Sr)x MnO3, where x = 0.28 to 0.375

Published online by Cambridge University Press:  31 January 2011

J. L. MacManus-Driscoll ,
G. T. Tan ,
W. Y. Hung ,
A. V. Berenov ,
J. A. Alonso ,
M. G. Blamire ,
J. E. Evetts ,
F. Damay  and
L. F. Cohen
J. L. MacManus-Driscoll
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom
G. T. Tan
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom
W. Y. Hung
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom
A. V. Berenov
Affiliation:
Department of Materials, Imperial College, Prince Consort Road, London, SW7 2BP, United Kingdom
J. A. Alonso
Affiliation:
Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049, Madrid, Spain
M. G. Blamire
Affiliation:
Department of Metallurgy and Materials, Cambridge University, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
J. E. Evetts
Affiliation:
Department of Metallurgy and Materials, Cambridge University, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom
F. Damay
Affiliation:
Department of Physics, Imperial College, Prince Consort Road, London, SW7 2AZ, United Kingdom
L. F. Cohen
Affiliation:
Department of Physics, Imperial College, Prince Consort Road, London, SW7 2AZ, United Kingdom
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Abstract

A series of rhombohedral alkaline-earth-doped manganites, La1−x (Ca,Sr)x MnO3, were studied, with x = 0.28 to 0.375, a constant tolerance factor of 0.927 ± 0.002, a very small variation of the Mn–O bond angle (<0.3°), and constant ion size variance (ς2) of 0.0020 ± 0.0010. Compositional uniformity and crystallinity were excellent, and porosity low. The temperature of the maximum in the resistivity, Tm, for x 4 0.28 was higher (by more than 20 K) than previously reported. With increasing x (and at the same time increasing Ca for Sr substitution), the Mn–O bond length shortened, Tm decreased, and the polaron hopping activation energy increased, indicative of increased carrier localization. The behavior is opposite to the La1−xSrxMnO3 series and can be explained by a strong dependence of the electron–phonon interaction on Mn–O bond length. In order to maximize Tm, Mn–O bond length must be controlled to a precise degree.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 5 , May 2000 , pp. 1167 - 1175
Copyright
Copyright © Materials Research Society 2000

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References

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