Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-11-12
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.
Devereaux Thomas P.
Hussain Zahid
Mannella Norman
Mitchell John F.
Nagaosa Naoto
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