期刊
SCIENTIFIC REPORTS
卷 4, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep04726
关键词
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资金
- Department of Energy [DE-FE0003780]
- Natural Science Foundation of China [11329402]
- State of Texas through the Texas Center for Superconductivity at the University of Houston
- China Scholarship Council
- Direct For Education and Human Resources
- Division Of Human Resource Development [1249284] Funding Source: National Science Foundation
Surface exchange and oxygen vacancy diffusion dynamics were studied in double-perovskites LnBaCo(2)O(5.5+delta) (LnBCO) single-crystalline thin films (Ln = Er, Pr;-0.5 < 0.5) by carefully monitoring the resistance changes under a switching flow of oxidizing gas (O-2) and reducing gas (H-2) in the temperature range of 250 similar to 800 degrees C. A giant resistance change Delta R by three to four orders of magnitude in less than 0.1 s was found with a fast oscillation behavior in the resistance change rates in the Delta R vs. t plots, suggesting that the oxygen vacancy exchange diffusion with oxygen/hydrogen atoms in the LnBCO thin films is taking the layer by layer oxygen-vacancy-exchange mechanism. The first principles density functional theory calculations indicate that hydrogen atoms are present in LnBCO as bound to oxygen forming O-H bonds. This unprecedented oscillation phenomenon provides the first direct experimental evidence of the layer by layer oxygen vacancy exchange diffusion mechanism.
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