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An Tiferro Magnetic-Ferromagnetic Cu-O-Cu Coupljng Change in Copper Oxides: Se1-xTexCuO3 Perovskites

Published online by Cambridge University Press:  16 February 2011

M. A. Subramanian  and
A. P. Ramirez
M. A. Subramanian
Affiliation:
DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880-0328
A. P. Ramirez
Affiliation:
Bell Laboratories, Lucent Technologies, 600 Mountain Avenue Murray Hill, NJ 07974-0636
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Abstract

Se1-xTeCuO3 (O≤x<1) phases crystallizing in perovskite structure with divalent copper at the octahedral sites have been characterized by x-ray diffraction, magnetization measurements and specific heat. The perovskites are unusual for possessing an extremely small A-site cation (Se4+, Te4+) with Cu-O-Cu bond angles in the range 120-130°. A continuous evolution in both structural and bulk properties is observed between the ferromagnetic (FM) ground state for x = 0 and an antiferromagnetic (AF) state for x = 1. The correlation of structural and magnetic properties allows the first determination of the Cu-O-Cu bond angle where the superexchange interaction sign changes, providing a quantitative realization of the Anderson-Goodenough-Kanemori rules for copper-oxide compounds.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 169
Copyright
Copyright © Materials Research Society 1999

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References

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