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Melting and Reentrant Freezing of Two-Dimensional Colloidal Crystals in Confined Geometry
Author(s) -
R. Bubeck,
Clemens Bechinger,
S. Neser,
P. Leǐderer
Publication year - 1999
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.82.3364
Subject(s) - reentrancy , colloid , shell (structure) , spheres , condensed matter physics , materials science , field (mathematics) , order (exchange) , physics , chemistry , composite material , finance , astronomy , pure mathematics , economics , mathematics
We study the melting behavior of a finite number (N # 45) of paramagnetic colloidal spheres in a two-dimensional circular hard wall cavity. The interaction strength between the particles is varied by applying a magnetic field B. At high B, i.e., strong interaction, the particles are arranged in a highly ordered shell-like structure. With decreasing B we observe first a loss of angular order between adjacent shells. Upon further reduction of the external B field, however, angular order is restored again before the system melts completely. We propose a simple mechanism to account for this reentrance phenomenon. [S0031-9007(99)08972-3]

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