Thermoelectric power of cerium at high pressures |
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Authors: | T G Ramesh A S Reshamwala S Ramaseshan |
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Institution: | (1) Materials Science Division, National Aeronautical Laboratory, 560017 Bangalore |
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Abstract: | The electronic phase transition in cerium occurring near 7 kbar pressure at room temperature which is attributed to the 4f–5d
electron promotion has been studied using thermoelectric power as a tool. The important results that have emerged out of this
work are: (a) the relatively large variation in the absolute thermoelectric power ofγ-cerium (normal fcc phase) with pressure prior to the phase transition (in contrast to the rather small resistivity change
with pressure in this region); (b) a sharp decrease in the thermoelectric power accompanying the iso-structuralγ-α phase transition; and (c) the continuous decrease in the thermoelectric power ofα-cerium (collapsed fcc phase) with pressure, ultimately changing sign at higher pressures. An explanation based on the “virtual
bound state” model is proposed to account for these results. |
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Keywords: | Thermoelectric power cerium high pressure |
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