• A S Reshamwala

      Articles written in Pramana – Journal of Physics

    • Thermoelectric power of cerium at high pressures

      T G Ramesh A S Reshamwala S Ramaseshan

      More Details Abstract Fulltext PDF

      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.

    • An automatic technique for the measurement of thermoelectric power at high pressures

      T G Ramesh A S Reshamwala M T Srivatsa

      More Details Abstract Fulltext PDF

      We describe an automatic technique for direct recording of the themoelectric power of metals either as a function of temperature or pressure. This technique facilitates the process of measurement especially when one has to scan a wide temperature and pressure range. Typical experimental recordings of the γ-α electronic phase transition in cerium are also presented.

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