4.8 Article

Anisotropic defect-mediated melting of two-dimensional colloidal crystals

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PHYSICAL REVIEW LETTERS
卷 93, 期 10, 页码 -

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AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.93.105702

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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.

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