Charge disorder effects in 3d transition metal oxide perovskites |
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| Authors: | AJ Williams BM Sobotka JP Attfield |
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| Institution: | a Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UKb Interdisciplinary Research Centre in Superconductivity, University of Cambridge, Madingley Road, Cambridge CB3 0HE, UK |
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| Abstract: | The effects of the random electrostatic potential due to differences in formal charge between A site R3+ (lanthanide, Y), M2+ (Ca, Sr, Ba) and Th4+ cations have been investigated in ferromagnetic AMnO3 and superconducting A2CuO4 perovskites. Series of samples in which the mean A site charge and the mean and variance of the A cation radius distribution are held constant, but the A site charge variance increases, show no significant changes of the electronic (Curie or superconducting) transition temperatures. The effect of the A cation random potentials on electronic transitions in the 3d metal oxide perovskites are insignificant in comparison to the lattice effects from the differing cation sizes. |
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| Keywords: | Manganese oxide Perovskites Cuprate super-conductors Charge variance Random potentials Lattice effects |
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