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Rhenium (Re) oxide films were deposited by radio-frequency sputtering. The lowest resistivity was observed in the film annealed at 200 °C, which showed an order of 10 −4 Ω cm, a value that was still about ten times as large as that of the single-crystal ReO 3 . The temperature dependence of the resistivity revealed a metallic behaviour. Superconductivity was not, however, observed for the bilayered film of NdBa 2 Cu 3 O 6 /ReO 3 .
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Ohkubo et al. (2002) studied this question.
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