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Na x CoO 2 (x∼0.68) thin films were fabricated on sapphire (0001) substrates via the lateral diffusion of sodium into Co 3 O 4 (111) films, which were grown by pulsed-laser deposition. From the results of X-ray diffraction and in-plane resistivity ρ ab , the single phase and the metallic behaviors of these Na x CoO 2 films can be identified....
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