• S N Bhatia

      Articles written in Pramana – Journal of Physics

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

      S N Bhatia

      More Details Abstract Fulltext PDF

      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.

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