Large magnetoresistance and Jahn-Teller effect in Sr 2 FeCoO 6

R. Pradheesh, Harikrishnan Nair, V. Sankaranarayanan and K. Sethupathi

The European Physical Journal B: Condensed Matter and Complex Systems, 2012, vol. 85, issue 8, 1-8

Abstract: Neutron diffraction measurement on the spin glass double perovskite Sr 2 FeCoO 6 reveals site disorder as well as Co 3+ intermediate spin state. In addition, multiple valence states of Fe and Co are confirmed through Mössbauer and X-ray photoelectron spectroscopy. The structural disorder and multiple valence lead to competing ferromagnetic and antiferromagnetic interactions and subsequently to a spin glass state, which is reflected in the form of an additional T-linear contribution at low temperatures in specific heat. A clear evidence of Jahn-Teller distortion at the Co 3+ –O 6 complex is observed and incorporating the physics of Jahn-Teller effect, the presence of localized magnetic moment is shown. A large, negative and anomalous magnetoresistance of ≈63% at 14 K in 12 T applied field is observed for Sr 2 FeCoO 6 . The observed magnetoresistance could be explained by applying a semi-empirical fit consisting of a negative and a positive contribution and show that the negative magnetoresistance is due to spin scattering of carriers by localized magnetic moments in the spin glass phase. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2012

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1140/epjb/e2012-30264-2

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