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W2077280070 abstract "Abstract Heteroepitaxial (Ba, Sr)TiO3 (BST) films were grown on cleaved single crystal MgO substrates by pulsed laser deposition. Highly oriented BST films with atomic flat surfaces were obtained. By measuring Current–Voltage characteristics, a significant negative temperature coefficient of resistance (about − 4.95% at 300 K) was observed which is different from the positive temperature effect as reported for poly-crystal BST films. As has been suggested the positive temperature coefficient of resistance is attributed to the temperature-dependent barrier height and width at grain boundaries. In this paper, the negative temperature effect of resistance observed in our experiment is discussed and explained by the activation of electrons trapped by oxygen vacancies and absence of grain boundaries. Deep level spectroscopy measurement indicated that the activation energy is approximately 0.31 eV, which is consistent with the value deduced from the slope of ln ⁡ R ∼ 1 T curve." @default.
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W2077280070 date "2007-02-01" @default.
W2077280070 modified "2023-09-26" @default.
W2077280070 title "High negative temperature coefficient of resistance of heteroepitaxial (Ba, Sr) TiO3 single crystal films prepared by pulsed laser deposition" @default.
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W2077280070 doi "https://doi.org/10.1016/j.surfcoat.2006.07.157" @default.
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