• D P Verma

      Articles written in Pramana – Journal of Physics

    • Lattice sum of electric field gradients in tetragonal crystals

      D P Verma A Yadav H C Verma

      More Details Abstract Fulltext PDF

      A new method to calculate the lattice contribution to electric field gradients at a nuclear site in tetragonal crystals is developed. The crystal is regarded as an assembly of positive ions at lattice points embedded in a uniform background of negative charge (point charge model). The method uses Euler-Maclaurin formula and makes the plane-wise summation in the direct crystal space unlike most of the previous methods utilising Fourier transform to reciprocal space. The numerical values obtained using the above approach agree well with previous results.

    • Electric field gradients in simple tetragonal lattice at interstitial site

      D P Verma B Kumar H C Verma

      More Details Abstract Fulltext PDF

      Electric field gradient (efg) is calculated at the centre of the cell in the simple tetragonal crystal. The method uses Euler-Maclaurin summation formula and makes the planewise summation in the direct crystal space without any special regrouping of charges in point charge model. The results are in fair agreement with previous results of de Wette on the same system using Fourier transform to reciprocal space.

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