Study of Magnetic Properties of A2B'NbO6 (A=Ba,Sr, (BaSr): and B'=Fe and Mn) double perovskites
N. Rama, J. B. Philipp, M. Opel, K. Chandrasekaran, V. Sankaranarayanan, R. Gross, M. S. Ramachandra Rao
Abstract
We have studied the magnetic properties of Ba2FeNbO6 and Ba2MnNbO6. it is seen that Ba2FeNbO6 is an antiferromagnet with a weak ferromagnetic behaviour at 5K while Ba2MnNbO6 shows two magnetic transitions one at 45 K and the other at 12K. Electron spin resonance (ESR) measurements at room temperature show that the Mn compound does not show any Jahn-Teller distortion. It is also seen that the Neel temperature of the A2FeNbO6 (A=Ba,Sr, BaSr) compounds do not vary significantly. However variations in the average A-site ionic radius influence the formation of short range correlations that persist above TN.
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