Polaron coherence condensation as the mechanism for colossal magnetoresistance in layered manganites.
Angle-resolved photoemission spectroscopy data for the bilayer manganite La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} 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 La{sub 1.2}Sr{sub 1.8}Mn{sub 2}O{sub 7} can be regarded as a polaron coherence condensation process acting in concert with the double exchange interaction.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1000689
- Report Number(s):
- ANL/MSD/JA-68700
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: 2007 Vol. 76; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- ENGLISH
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