Polaron coherence condensation as the mechanism for colossal magnetoresistance in layered manganites

N. Mannella, W. L. Yang, K. Tanaka, X. J. Zhou, H. Zheng, J. F. Mitchell, J. Zaanen, T. P. Devereaux, N. Nagaosa, Z. Hussain, and Z.-X. Shen
Phys. Rev. B 76, 233102 – Published 14 December 2007
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    Abstract

    Angle-resolved photoemission spectroscopy data for the bilayer manganite La1.2Sr1.8Mn2O7 show that, upon lowering the temperature below the Curie point, a coherent polaronic metallic ground state emerges very rapidly with well-defined quasiparticles which track remarkably well the electrical conductivity, consistent with macroscopic transport properties. Our data suggest that the mechanism leading to the insulator-to-metal transition in La1.2Sr1.8Mn2O7 can be regarded as a polaron coherence condensation process acting in concert with the double exchange interaction.

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    • Received 7 May 2007

    DOI:https://doi.org/10.1103/PhysRevB.76.233102

    ©2007 American Physical Society

    Authors & Affiliations

    N. Mannella1,2,*, W. L. Yang1,2, K. Tanaka1,2, X. J. Zhou1,2, H. Zheng3, J. F. Mitchell3, J. Zaanen4, T. P. Devereaux5, N. Nagaosa6, Z. Hussain2, and Z.-X. Shen1,†

    • 1Department of Physics and Department of Applied Physics, Stanford University, Stanford, California 94305, USA
    • 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
    • 3Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
    • 4Instituut Lorentz for Theoretical Physics, Leiden University, P. O. Box 9506, 2300 RA Leiden, The Netherlands
    • 5Department of Physics, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
    • 6CREST, Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

    • *nmannell@utk.edu
    • †zxshen@stanford.edu

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    Vol. 76, Iss. 23 — 15 December 2007

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