Anisotropic mean-square displacements in two-dimensional colloidal crystals of 
tilted dipoles

Froltsov, V. A.; Likos, C. N.; Löwen, H.; Eisenmann, C.; Gasser, U.; Keim, P.; Maret, G.

doi:10.1103/Physreve.71.031404

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Anisotropic mean-square displacements in two-dimensional colloidal crystals of tilted dipoles

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

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Citation

Froltsov, V. A., Likos, C. N., Löwen, H., Eisenmann, C., Gasser, U., Keim, P., et al. (2005). Anisotropic mean-square displacements in two-dimensional colloidal crystals of tilted dipoles. Physical Review E, 71(3): 031404. doi:10.1103/Physreve.71.031404.

Cite as: https://hdl.handle.net/21.11116/0000-0009-858D-2

Abstract

Superparamagnetic colloidal particles confined to a flat horizontal air-water interface in an external magnetic
field, which is tilted relative to the interface, form anisotropic two-dimensional crystals resulting from their
mutual dipole-dipole interactions. Using real-space experiments and harmonic lattice theory we explore the
mean-square displacements of the particles in the directions parallel and perpendicular to the in-plane component of the external magnetic field as a function of the tilt angle. We find that the anisotropy of the mean-square
displacement behaves nonmonotonically as a function of the tilt angle and does not correlate with the structural
anisotropy of the crystal.