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

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Description

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 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 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.

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4 pages

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Mannella, N.; Yang, W. L.; Tanaka, K.; Zhou, X. J.; Zheng, H.; Mitchell, J. F. et al. November 20, 2007.

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Description

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 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 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.

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4 pages

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  • Report No.: SLAC-PUB-13017
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/920014 | External Link
  • Office of Scientific & Technical Information Report Number: 920014
  • Archival Resource Key: ark:/67531/metadc901312

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  • November 20, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Aug. 1, 2017, 11:43 a.m.

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Mannella, N.; Yang, W. L.; Tanaka, K.; Zhou, X. J.; Zheng, H.; Mitchell, J. F. et al. Polaron Coherence Condensation As the Mechanism for Colossal Magnetoresistance in Layered Manganites, report, November 20, 2007; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc901312/: accessed September 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.