Anisotropic Defect-Mediated Melting of Two-Dimensional Colloidal Crystals | Zendy

Christoph Eisenmann | Zendy; Urs Gasser | Zendy; Peter Keim | Zendy; G. Maret | Zendy

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Anisotropic Defect-Mediated Melting of Two-Dimensional Colloidal Crystals

Author(s) -

Christoph Eisenmann,

Urs Gasser,

Peter Keim,

G. Maret

Publication year - 2004

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.93.105702

Subject(s) - condensed matter physics , anisotropy , isotropy , materials science , dipole , superparamagnetism , phase transition , dislocation , plane (geometry) , orientation (vector space) , colloid , phase (matter) , field (mathematics) , particle (ecology) , colloidal particle , magnetic field , physics , magnetization , optics , quantum mechanics , chemistry , geometry , mathematics , oceanography , geology , pure mathematics

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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