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Raman spectra from the MgO substrate, pure- film (pure-), coevaporated mixture film (Refs. 9 and 10), and the film . The Raman-active peaks of are labeled and for the pure . The peak commonly found is ascribed to the in the air.
Temperature dependence of the electrical resistivity under a small bias voltage of at and at .
Bias voltage dependence of the differential resistivity (DR) at . The inset shows the curve measured at .
(a) Bias voltage ( dependence of the MR ratio at and the typical MR curves at (inset). (b) Temperature dependence of , , and at . The broken and dotted lines represent the guideline for at the higher and lower temperatures than .
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