Abstract
We have systematically measured the electrical resistivities and thermopowers of transparent tin-doped indium oxide films. We found that the resistivities obey the Bloch-Grüneisen law between 25 and 300K, whereas below 25K, the resistivities slightly increase logarithmically with the decreasing temperature due to the weak-localization and electron-electron interaction effects. The thermopowers are negative and decrease linearly with temperature from 300K down to 1.8K. Our results strongly indicate that the tin-doped indium oxide films behave as a good, free-electron-like conductor while being transparent.
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