Two-Dimensional Melting under Quenched Disorder

Deutschländer, Sven; Horn, Tobias; Löwen, Hartmut; Maret, Georg; Keim, Peter

doi:10.1103/PhysRevLett.111.098301

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Two-Dimensional Melting under Quenched Disorder

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

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Citation

Deutschländer, S., Horn, T., Löwen, H., Maret, G., & Keim, P. (2013). Two-Dimensional Melting under Quenched Disorder. Physical Review Letters, 111(9): 098301. doi:10.1103/PhysRevLett.111.098301.

Cite as: https://hdl.handle.net/21.11116/0000-0009-867C-5

Abstract

We study the influence of quenched disorder on the two-dimensional melting behavior of superparamagnetic colloidal particles, using both video microscopy and computer simulations of repulsive
parallel dipoles. Quenched disorder is introduced by pinning a fraction of the particles to an underlying
substrate. We confirm the occurrence of the Kosterlitz-Thouless-Halperin-Nelson-Young scenario and
observe an intermediate hexatic phase. While the fluid-hexatic transition remains largely unaffected by
disorder, the hexatic-solid transition shifts to lower temperatures with increasing disorder. This results in a
significantly broadened stability range of the hexatic phase. In addition, we observe spatiotemporal critical
(like) fluctuations, which are consistent with the continuous character of the phase transitions.
Characteristics of first-order transitions are not observed.