The Specific Heat of a Ferromagnetic Film.

Details The Specific Heat of a Ferromagnetic Film. The Specific Heat of a Ferromagnetic Film.

1995-03-19

arxiv.org/abs/cond-mat/9503110v1

Physics

Condensed Matter

21 pages of Plain TeX. Postscript figures available upon request from denjoe@stp.dias.ie

Scientific paper

10.1103/PhysRevE.53.189

We analyze the specific heat for the $O(N)$ vector model on a $d$-dimensional film geometry of thickness $L$ using ``environmentally friendly'' renormalization. We consider periodic, Dirichlet and antiperiodic boundary conditions, deriving expressions for the specific heat and an effective specific heat exponent, $\alpha\ef$. In the case of $d=3$, for $N=1$, by matching to the exact exponent of the two dimensional Ising model we capture the crossover for $\xi_L\ra\infty$ between power law behaviour in the limit ${L\over\xi_L}\ra\infty$ and logarithmic behaviour in the limit ${L\over\xi_L}\ra0$ for fixed $L$, where $\xi_L$ is the correlation length in the transverse dimensions.

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