An Ising model in a magnetic field with a boundary

Details An Ising model in a magnetic field with a boundary An Ising model in a magnetic field with a boundary

1995-11-19

arxiv.org/abs/cond-mat/9511090v1

J.Phys. A29 (1996) L61-L68

Physics

Condensed Matter

7 pages, LaTeX

Scientific paper

10.1088/0305-4470/29/4/001

We obtain the diagonal reflection matrices for a recently introduced family of dilute ${\rm A}_L$ lattice models in which the ${\rm A}_3$ model can be viewed as an Ising model in a magnetic field. We calculate the surface free energy from the crossing-unitarity relation and thus directly obtain the critical magnetic surface exponent $\delta_s$ for $L$ odd and surface specific heat exponent for $L$ even in each of the various regimes. For $L=3$ in the appropriate regime we obtain the Ising exponent $\delta_s = -\frac{15}{7}$, which is the first determination of this exponent without the use of scaling relations.

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