• Equivalence of the Krieger-James approximation and the constant-coupling approximation in magnetism

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    • Keywords


      Krieger-James approximation; constant coupling approximation; magnetism

    • Abstract


      We have applied the Krieger-James approximation to a description of short range order effects in both ferro- and antiferromagnetism. In this method, a mechanical consistency condition is imposed on the probability distribution of a pair of near neighbours in a cluster of (Z+1) ions. The resulting theory is analytically equivalent to the familiar constant coupling approximation, thus ensuring thermodynamic equilibrium of the system.

    • Author Affiliations


      K L Savithramma1 N V Madhusudana1

      1. Raman Research Institute, Bangalore - 560 006
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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