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

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

2007-11-12

arxiv.org/abs/0711.1732v1

Phys. Rev. B 76, 233102 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, in press

Scientific paper

10.1103/PhysRevB.76.233102

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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