Physics – Condensed Matter
Scientific paper
2002-10-05
Phys. Rev. Lett. {\bf 90}, 155506 (2003)
Physics
Condensed Matter
4 pages, Latex, 4 eps figures
Scientific paper
10.1103/PhysRevLett.90.155506
Elastic constants of two-dimensional (2D) colloidal crystals are determined by measuring strain fluctuations induced by Brownian motion of particles. Paramagnetic colloids confined to an air-water interface of a pending drop are crystallized under the action of a magnetic field, which is applied perpendicular to the 2D layer. Using video-microscopy and digital image-processing we measure fluctuations of the microscopic strain obtained from random displacements of the colloidal particles from their mean (reference) positions. From these we calculate system-size dependent elastic constants, which are extrapolated using finite-size scaling to obtain their values in the thermodynamic limit. The data are found to agree rather well with zero-temperature calculations.
Maret Georg
Nielaba Peter
Sengupta Supratim
Wille Anton
Zahn Klaus
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