**Authors**:
G. Gallavotti, A. Martin-Lof

**Title**:
* Surface Tension in the Ising Model*

Communication in Mathematical Physics, ** 25**, 87--126, 1972

**Abstract:** We investigate the problem of a
microscopic definition of the surface of separation between two phases
in the special case of the 2-dimensional Ising model. We show how this
leads to a definition of the surface tension which appears, in this
context, as the logarithm of a partition function over a set of random
surfaces. We also discuss the more general problem of defining the
surface tension in an Ising ferromagnet with arbitrarily extended
attractive interaction.

**Key words: **
Statistical Mechanics, Surface Tension, Ising Model,
Thermodynamic Limit, Lattice Gas

Giovanni Gallavotti

Fisica, Universita' di Roma 1

P.le Moro 2

00185 Roma, Italia

tel +39-06-4991-4370

fax +39-06-4957697

em: giovanni.gallavotti@roma1.infn.it

http://ipparco.roma1.infn.it