S K Das
Articles written in Pramana – Journal of Physics
Volume 8 Issue 2 February 1977 pp 117-122 Solids
An electron fluid model is proposed for the lattice dynamics of metals which satisfies the requirement of translational invariance and the lattice is in equilibrium without recourse to external forces. The model is applied to calculate the phonon dispersion of sodium in the symmetry directions.
Volume 15 Issue 5 November 1980 pp 495-499 Solid State Physics
Ashcroft’s empty core pseudopotential is applied to the substitutional alloy (K-CS) to calculate the heat of formation and lattice parameter over the entire concentration range. At any concentration the defect crystal is considered to be equivalent to a perfect crystal with a modified lattice parameter and the potential parameter for the defect crystal is calculated by using some suitable interpolation formula. The calculated results agree well with the available experimental results.
Volume 17 Issue 5 November 1981 pp 419-427 Solid State Physics
Unified study of the different properties of metals clearly reveals the inadequacy of the empty-core Ashcroft pseudopotential even in the case of simple metals. In the present paper we propose a modification of the one-parameter Ashcroft pseudopotential by assuming the parameter
Volume 25 Issue 1 July 1985 pp 21-27 Particle Physics
The magnetic moments of charmed baryons are studied in the covariant oscillator quark model including isospin symmetry breaking effect. In the uncharmed sector, the results differ from those obtained using conventional non-relativistic quark model (
Volume 47 Issue 4 October 1996 pp 309-315
A model of knock-out of oxygen by charged particle (
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