• Heat capacity of MnBr2·4H2O near the antiferromagnetic transition temperature

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    • Keywords

       

      Heat capacity; critical phenomenon; scaling; renormalisation group theory

    • Abstract

       

      Heat capacity of MnBr2·4H2O has been measured in the critical region around the Neel temperature. The data can be fitted, over a restricted range of |t|⩽10−2, to the asymptotic power law. The critical exponents and the amplitudesA andA′ are not consistent with any theoretic predictions. However when scaling constraints are imposed, their values agree with the parameters of Ising model. Corrections to scaling are necessary to extend the range of the fit to |t|>10−2. The correction terms are asymmetric giving −1·15±0·25 as the ratio of the amplitudes of the lowest order correction terms,D andD′ above and belowTc. This value is in agreement with the recent predictions of the renormalisation group theory.

    • Author Affiliations

       

      S N Bhatia1

      1. Department of Physics, Indian Institute of Technology, Bombay - 400 076, India
    • Dates

       
  • Pramana – Journal of Physics | News

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