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Cation Size and Disorder Effects in Conducting Perovskite Oxides

Published online by Cambridge University Press:  16 February 2011

J. Paul Attifield ,
Andrei L. Kharlanov ,
Judith A. McAllister  and
Lide M. Rodriguez-Martinez
J. Paul Attifield
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW and Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK, [email protected]
Andrei L. Kharlanov
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW and Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK, [email protected]
Judith A. McAllister
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW and Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK, [email protected]
Lide M. Rodriguez-Martinez
Affiliation:
Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW and Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK, [email protected]
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Abstract

The electronic and magnetic properties of ATO3 and related perovskites (A is a mixture of lanthanide Ln3+ and alkaline earth M2+ cations; T is a transition metal) are very sensitive to the A site composition. The importance of doping effects controlled by the Ln3+/M2+ ratio is well-known, but the other lattice effects controlled by the sizes of these cations are less well understood. A simple approach making use of the mean (first moment) and the variance (second moment) in the A cation distribution has been applied to the metal-insulator transition temperature in colossal magnetoresistance AMnO3 perovskites and to the critical temperature in A2CuO4 and LnBa2Cu3O7-δ superconductors. Series of compositions prepared with a constant doping level and mean A cation radius show a linear decrease of the transition temperature Tt with the A cation size variance σ2. The rate of decrease -dTt/dσ2 is found to lie in the range 1,000-30,000 KÅ-2. The orthorhombic-tetra onal structural transition in the A2CuO4 materials is found to show a linear increase with σ2. A pair of quadratic relationships for the mean size and size variance effects are proposed to be the result of changing strain energies that give rise to these effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 15
Copyright
Copyright © Materials Research Society 1999

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