Volume 74, Number 2, April 2006
|Page(s)||355 - 361|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||15 March 2006|
Solid-liquid transition in 2D dipolar systems
Institut des NanoSciences de Paris, UMR 7588-CNRS, Universités Paris 6 & Paris 7 Campus Boucicaut, 75015 Paris, France
2 Laboratoire MPQ UMR 7162-CNRS, Université Paris 7, case 7020 2 place Jussieu, 75251 Paris, France
Accepted: 23 February 2006
The solid-liquid phase diagram of two-dimensional, laterally confined systems made of interacting parallel dipoles normal to the plane is investigated by Monte Carlo method. The lowest-energy solid phase is relaxed from a regular triangular lattice. This Wigner crystal phase keeps the main features of the original monocrystal. On the other hand, the solid phase relaxed from a random initial configuration has a slightly higher energy and is called Wigner glass. It exhibits randomly oriented crystallites separated by chains of topological defects, namely alternate 5- and 7-nearest-neighbour sites. These chains start to move within the solid phase at a temperature lower than the bulk melting temperature.
PACS: 75.70.Rf – Surface magnetism / 64.70.Dv – Solid-liquid transitions / 62.20.Dc – Elasticity, elastic constants
© EDP Sciences, 2006
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