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Epitaxial Ca3Co4O9 thin films were deposited on c-cut sapphire substrates by the chemical solution method. The room temperature resistivity and the Seebeck coefficient of the films are about 11 mΩ cm and 130 µV K−1, which are comparable to those of single crystals. A large nonlinear resistivity related to the suppression of spin-density-waves by an external electric field is also observed at low temperature.
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Wang et al. (2009) studied this question.
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