Articles written in Pramana – Journal of Physics
Volume 5 Issue 3 September 1975 pp 118-123 Solids
Starting from a definition of the localisation-delocalisation of electronic, wavefunctions in disordered systems based on the nature of the disordered spectrum, a delocalisation criterion identical to that of Abou-Chacra
Volume 11 Issue 2 August 1978 pp 223-232 Statistical Physics
Starting from a physical RKKY interaction model for magnetic alloys and a valid probabilistic description of a random substitutional alloy, the possible phases have been studied in a mean field, effective medium theory. Most of the detailed objections raised against former treatments of these systems have been removed.
Volume 14 Issue 1 January 1980 pp 11-17 Solid State Physics
A classical Heisen berg model is analysed. The interaction is of the RKKY type and only between sites randomly occupied by magnetic atoms. The possible phases are described at various temperatures and concentration of magnetic atoms. The procedure is realistic and not the ‘exactly’ solvable kind studied by earlier workers.
Volume 23 Issue 2 August 1984 pp 257-261 Statistical Physics
Volume 58 Issue 2 February 2002 pp 399-408
We present here a set of coupled continuum equations to describe atomic deposition. We take into account evaporation due to thermal and mechanical disturbances as well as subsequent accretion at favourable grooves.
Volume 70 Issue 2 February 2008 pp 221-235 Invited Papers
We discuss an application of the generalized augmented space method introduced by one of us combined with the recursion method of Haydock
Volume 76 Issue 4 April 2011 pp 639-656
We study the electronic structure and a mean-ﬁeld phase analysis based on the pair–pair energies derived from ﬁrst-principles electronic structure calculations of AuFe and NiMo alloys. We have used the tight-binding linear mufﬁn-tin orbitals-based augmented space recursion (TB-LMTO-ASR) method to do so. We investigate different behaviours of the two alloy systems by mapping the problems onto equivalent Ising models and then discuss the magnetic phase diagrams using the calculated pair energies. All three phases: paramagnetic, random ferromagnetic and spin glass, have been studied.
Volume 94, 2020
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