Articles written in Pramana – Journal of Physics
Volume 9 Issue 2 August 1977 pp 179-188 Solids
The susceptibility of a bond disordered Ising model is calculated by configurationally averaging an Ornstein-Zernike type of equation for the two spin correlation function. The equation for the correlation function is derived using a diagrammatic method due to Englert. The averaging is performed using bond CPA. The magnetisation is also calculated by averaging in a similar manner a linearised molecular field equation.
Volume 11 Issue 6 December 1978 pp 673-695 Solids
Some of the cluster extensions of the coherent potential approximation (CPA) based on the effective medium theory have been critically studied with respect to the decoupling schemes involved in them. Their computational tractability has been examined and it has been found that the
Volume 93 | Issue 5
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