(002) rocking curves of and thin films. For the thin film, the increase in FWHM indicates that the crystallinity of thin film along the out-of-plane orientation becomes deteriorated after the Na deintercalation.
-scans of (104) peak of thin films and (104) peak of (001) sapphire substrate for (a) and (b) thin films. From the increase in the FWHM of the (104) peaks, it is inferred that the crystallinity of the along the in-plane orientation is also influenced by the Na deintercalation.
Resistivities of (a) and (b) thin films. The resistivity of thin film shows a Curie–Weiss metallic property similar to the resistivity of single crystal. The exhibits the transport behavior of a charge-ordered insulator.
Optical conductivities of and thin films.
Temperature dependences of thermoelectric power for and thin films. The power factors of and thin films are 27 and , respectively.
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