• P K Mukhopadhyay

      Articles written in Pramana – Journal of Physics

    • Effect of correlation and spin-polarisation on the band structure of metallic dysprosium

      P K Mukhopadhyay C K Majumdar K C Das

      More Details Abstract Fulltext PDF

      Energy bands of dysprosium have been calculated considering the effects of correlation and spin-polarisation. The exchange and correlation contributions to the spherically symmetric crystalline potential have been taken in the forms suggested by (i) Kohn and Sham and (ii) Overhauser. The exchange and correlation potential of von Barth and Hedin has been used to study the effect of spin-polarisation on the band structures. The resulting bandwidth, density of states, magnetic moment and spin-splitting have been computed and compared with experimental results. Some discrepancies remain; theoretical calculations done so far agree reasonably among themselves, so accurate experimental data are probably called for.

    • Contact charge density in metallic dysprosium

      P K Mukhopadhyay K C Das

      More Details Abstract Fulltext PDF

      The contact conduction electron density in metallic dysprosium has been calculated following the APW formalism and taking into account the effects of correlation and spin-polarization. A comparison of this density with that obtained from the Mössbauer isomer shift measurement has been made. An estimate of Δ〈r2〉, the change in mean square nuclear charge radius between the two levels involved in theγ transition, has been made and compared with those obtained by other workers.

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