Numéro
J. Phys. IV France
Volume 03, Numéro C2, Juillet 1993
International Workshop on Electronic Crystals
ECRYS - 93
Page(s) C2-159 - C2-162
DOI http://dx.doi.org/10.1051/jp4:1993232
International Workshop on Electronic Crystals
ECRYS - 93

J. Phys. IV France 03 (1993) C2-159-C2-162

DOI: 10.1051/jp4:1993232

Slightly perturbed two-dimensional solid : crystal, hexatic or glass ?

R.E. KUSNER1, J.A. MANN2, J. KERINS3, WJ. BENTON3, 4 and A.J. DAHM1

1  Department of Physics, Case Western Reserve University, Cleveland, OH 44106, U.S.A.
2  Department of Chemical Engineering, Case Western Reserve University, Cleveland, OH 44106, U.S.A.
3  BP America Warrensville Research and Environmental Science Center, Warrensville Center, OH 44128, U.S.A.
4  BP Research, Sunbury Research Center, Sunbury England


Abstract
Melting properties of a two-dimensional system comprised of ~ 1 µm diameter, monodispersed, polystyrene spheres are compared with those of a system containing a onepercent concentration of larger spheres which have a larger interparticle interaction. The spheres interact via a dipolar interaction which is controlled externally. The translational and bond-orientational correlation functions are examined as a function of the dipole strength. The monodispersed system exhibits two-stage melting. In the system with a one-percent concentration of larger spheres the correlation functions are characteristic of a hexatic phase at the largest interaction strengths. Dislocations are pinned to the larger particles.



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