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Polaron Coherence Condensation as the Mechanism for Colossal Magnetoresistance in Layered Manganites

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arxiv 0711.1732 v1 pith:CL7GBROE submitted 2007-11-12 cond-mat.str-el cond-mat.mtrl-sci

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
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N. Nagaosa Z. Hussain Z.-X. Shen
This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords coherencecondensationdatamechanismmn2o7polaronwellacting
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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 groundstate 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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