V Ramamurthy
Articles written in Pramana – Journal of Physics
Volume 11 Issue 3 September 1978 pp 233-243 Solids
The electron-ion interactions in metals
The electron-ion interactions are evaluated exactly over the actual shape of the atomic polyhedron, instead of approximating it by a sphere, by making use of simple coordinate axes transformations and lattice symmetry in the case of f.c.c. and b.c.c. structures. It is shown that there are several alternative ways of expressing the interference factor,
Volume 13 Issue 4 October 1979 pp 373-386 Solids
The electron-ion interactions in tetragonal metals
The electron-ion interactions are evaluated exactly over the actual shape of the atomic polyhedron, instead of approximating it by a sphere or an ellipsoid, by making use of simple co-ordinate axes transformations and lattice symmetry in the case of fct and bct structures. It is shown that there are several alternative ways of expressing the interference factor,
Volume 19 Issue 5 November 1982 pp 435-448 Solid State Physics
Lattice dynamical study of body-centred tetragonal indium
V Ramamurthy S B Rajendraprasad
The phonon dispersion curves, phonon frequency distribution function as well as the lattice specific heat of body-centred tetragonal indium have been deduced using a lattice dynamical model which includes central, angular and volume forces. Six elastic constants, four zone boundary frequencies and an equilibrium condition were used in the evaluation of the force constants. It is shown that this model is elastically consistent and satisfies the symmetry requirements of the lattice, the phonon frequencies of indium deduced from it are in very good agreement with the experimental values of Reichardt and Smith and the theoretical values of Garrett and Swihart, and the
Volume 23 Issue 6 December 1984 pp 751-765 Solid State Physics
Lattice dynamical study of alkali metals: An unified approach based on CGW model
The phonon dispersion relations for lithium, sodium, potassium, rubidium and cesium along the principal symmetry directions as well as their lattice specific heats have been deduced using Clark, Gazis and Wallis angular force model. This model which conforms to the translational symmetry of the lattice, reproduces the observed crossover in lithium along [ζ00] direction at ζ = 0·49, without producing any crossovers in other alkali metals. Besides, the theoretical dispersion curves of all alkali metals are in excellent agreement with the corresponding experimental or homologous dispersion relations and their
Volume 24 Issue 5 May 1985 pp 757-771 Solid State Physics
Electron-ion interactions in close packed metals
The electron-ion interactions are evaluated exactly over the actual shape of the atomic polyhedron by making use of simple co-ordinate axes transformations and lattice symmetry in the case of hcp and ccp structures. It is shown that the expressions for the interference factor,
Volume 25 Issue 5 November 1985 pp 603-616 Solid State Physics
V Ramamurthy S B Rajendraprasad
The origin of the elastic inconsistency of
Volume 26 Issue 6 June 1986 pp 525-542
Electron-phonon interactions in bct white tin
The electron-phonon interactions are evaluated exactly over the actual shape of the atomic polyhedron as well as the lattice polyhedron of diatomic white tin by making use of simple coordinate axes transformations and crystal symmetry. It is shown that the expressions for the interference factor,
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