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|a Katsiev, Khabiboulakh
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|a Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
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|a Yildiz, Bilge
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|a Yildiz, Bilge
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|a Katsiev, Khabiboulakh
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|a Balasubramaniam, Kavaipatti
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|a Salvador, Paul A.
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|a Electron tunneling characteristics on La[subscript 0.7]Sr[subscript 0.3]MnO[subscript 3] thin-film surfaces at high temperature
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|a Electron tunneling characteristics on La0.7Sr0.3MnO3 thin-film surfaces at high temperature
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|b American Institute of Physics,
|c 2011-11-30T21:32:02Z.
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|u http://hdl.handle.net/1721.1/67334
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|a 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.
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|a United States. Dept. of Energy (Office of Fossil Energy Award No. DE-NT0004117)
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|a Article
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|t Applied Physics Letters
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