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Condensed Matter > Strongly Correlated Electrons

arXiv:cond-mat/0703460 (cond-mat)
[Submitted on 19 Mar 2007 (v1), last revised 23 Jul 2007 (this version, v2)]

Title:Polaronic signature in the metallic phase of La0.7Ca0.3MnO3 films detected by scanning tunneling spectroscopy

Authors:S. Seiro, Y. Fasano, I. Maggio-Aprile, E. Koller, O. Kuffer, O. Fischer
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Abstract: In this work we map tunnel conductance curves with nanometric spatial resolution, tracking polaronic quasiparticle excitations when cooling across the insulator-to-metal transition in La0.7Ca0.3MnO3 films. In the insulating phase the spectral signature of polarons, a depletion of conductance at low bias flanked by peaks, is detected all over the scanned surface. These features are still observed at the transition and persist on cooling into the metallic phase. Polaron-binding energy maps reveal that polarons are not confined to regions embedded in a highly-conducting matrix but are present over the whole field of view both above and below the transition temperature.
Comments: 10 pages, 4 figures
Subjects: Strongly Correlated Electrons (cond-mat.str-el)
Cite as: arXiv:cond-mat/0703460 [cond-mat.str-el]
  (or arXiv:cond-mat/0703460v2 [cond-mat.str-el] for this version)
  https://doi.org/10.48550/arXiv.cond-mat/0703460
Related DOI: https://doi.org/10.1103/PhysRevB.77.020407

Submission history

From: Silvia Seiro [view email]
[v1] Mon, 19 Mar 2007 16:12:34 UTC (401 KB)
[v2] Mon, 23 Jul 2007 14:16:55 UTC (426 KB)
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