• S Ramasesha

      Articles written in Pramana – Journal of Physics

    • An explanation of the phenomenon of polytypism

      S Ramasesha

      More Details Abstract Fulltext PDF

      Based on the analogy between polytypes and spin-half Ising chains, polytypes can be considered as different phases of a spin-half Ising system with competing nearest neighbour and next nearest neighbour interactions operating in a single direction. It is known that such an Ising system exhibits extremely rich and complicated phase behaviour. This behaviour is shown to be very similar to the phase behaviour exhibited by polytypes.

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