Anisotropic defect-mediated melting of two-dimensional colloidal crystals

被引：50

作者：

Eisenmann, C ^{[1
]}

Gasser, U ^{[1
]}

Keim, P ^{[1
]}

Maret, G ^{[1
]}

机构：

[1] Univ Konstanz, Dept Phys, D-78457 Constance, Germany

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.93.105702

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The melting transition of anisotropic two-dimensional (2D) crystals is studied in a model system of superparamagnetic colloids. The anisotropy of the induced dipole-dipole interaction is varied by tilting the external magnetic field off the normal to the particle plane. By analyzing the time-dependent Lindemann parameter as well as translational and orientational order we observe a 2D smecticlike phase. The Kosterlitz-Thouless-Halperin-Nelson-Young scenario of isotropic melting is modified: dislocation pairs and dislocations appear with different probabilities depending on their orientation with respect to the in-plane field.

引用

页码：105702 / 1

页数：4

共 17 条

[1] The liquid-solid transition of hard discs: first-order transition or Kosterlitz-Thouless-Halperin-Nelson-Young scenario? [J].