Electron tunneling characteristics on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] thin-film surfaces at high temperature
Author(s)Katsiev, Khabiboulakh; Yildiz, Bilge; Balasubramaniam, Kavaipatti; Salvador, Paul A.
Electron tunneling characteristics on La0.7Sr0.3MnO3 thin-film surfaces at high temperature
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We report on the electron tunneling characteristics on La0.7Sr0.3MnO3 (LSM) thin-film surfaces up to 580 °C in 10[superscript −3] mbar oxygen pressure, using scanning tunneling microscopy/spectroscopy (STM/STS). A thresholdlike drop in the tunneling current was observed at positive bias in STS, which is interpreted as a unique indicator for the activation polarization in cation-oxygen bonding on LSM cathodes. Sr-enrichment was found on the surface at high temperature using Auger electron spectroscopy, and was accompanied by a decrease in tunneling conductance in STS. This suggests that Sr-terminated surfaces are less active for electron transfer in oxygen reduction compared to Mn-terminated surfaces on LSM.
DepartmentMassachusetts Institute of Technology. Department of Nuclear Science and Engineering
Applied Physics Letters
American Institute of Physics
Katsiev, Khabiboulakh et al. “Electron tunneling characteristics on La[sub 0.7]Sr[sub 0.3]MnO[sub 3] thin-film surfaces at high temperature.” Applied Physics Letters 95 (2009): 092106. © 2009 American Institute of Physics.
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