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Large magnetoresistance and Jahn-Teller effect in Sr2FeCoO6

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Abstract

Neutron diffraction measurement on the spin glass double perovskite Sr2FeCoO6 reveals site disorder as well as Co3+ 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 Co3+–O6 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 Sr2FeCoO6. 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.

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Authors and Affiliations

  1. Low Temperature Physics Laboratory, Department of Physics, Indian Institute of Technology Madras, 600036, Chennai, India

    R. Pradheesh, V. Sankaranarayanan & K. Sethupathi

  2. Jülich Center for Neutron Sciences 2/ Peter Grünberg Institute 4, Forschungszentrum Jülich GmbH, 52425, Jülich, Germany

    Harikrishnan S. Nair

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  1. R. Pradheesh
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  3. V. Sankaranarayanan
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  4. K. Sethupathi
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Pradheesh, R., Nair, H.S., Sankaranarayanan, V. et al. Large magnetoresistance and Jahn-Teller effect in Sr2FeCoO6 . Eur. Phys. J. B 85, 260 (2012). https://doi.org/10.1140/epjb/e2012-30264-2

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