Europhys. Lett.
Volume 75, Number 4, August 2006
Page(s) 583 - 589
Section Condensed matter: structural, mechanical and thermal properties
Published online 05 July 2006
Europhys. Lett., 75 (4), pp. 583-589 (2006)
DOI: 10.1209/epl/i2006-10140-7

Density functional theory of freezing for soft interactions in two dimensions

S. van Teeffelen, C. N. Likos, N. Hoffmann and H. Löwen

Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf Universitätsstraße 1, D-40225 Düsseldorf, Germany

received 11 April 2006; accepted in final form 20 June 2006
published online 5 July 2006

A density functional theory of two-dimensional freezing is presented for a soft interaction potential that scales as inverse cube of particle distance. This repulsive potential between parallel, induced dipoles is realized for paramagnetic colloids on an interface, which are additionally exposed to an external magnetic field. An extended modified weighted density approximation which includes correct triplet correlations in the liquid state is used. The theoretical prediction of the freezing transition is in good agreement with experimental and simulation data.

64.10.+h - General theory of equations of state and phase equilibria.
64.70.Dv - Solid-liquid transitions.
82.70.Dd - Colloids.

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