Publikation: Two-dimensional Melting under Quenched Disorder
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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.
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DEUTSCHLÄNDER, Sven, Tobias HORN, Hartmut LÖWEN, Georg MARET, Peter KEIM, 2013. Two-dimensional Melting under Quenched Disorder. In: Physical Review Letters. 2013, 111(9). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.111.098301BibTex
@article{Deutschlander2013Twodi-24497, year={2013}, doi={10.1103/PhysRevLett.111.098301}, title={Two-dimensional Melting under Quenched Disorder}, number={9}, volume={111}, issn={0031-9007}, journal={Physical Review Letters}, author={Deutschländer, Sven and Horn, Tobias and Löwen, Hartmut and Maret, Georg and Keim, Peter} }
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