Anisotropic defect-mediated melting of two-dimensional colloidal crystals

Eisenmann, C.; Gasser, U.; Keim, P.; Maret, G.

doi:10.1103/Physrevlett.93.105702

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Anisotropic defect-mediated melting of two-dimensional colloidal crystals

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Keim, P.
Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Eisenmann, C., Gasser, U., Keim, P., & Maret, G. (2004). Anisotropic defect-mediated melting of two-dimensional colloidal crystals. Physical Review Letters, 93(10): 105702. doi:10.1103/Physrevlett.93.105702.

Cite as: https://hdl.handle.net/21.11116/0000-0009-85A2-9

Abstract

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.