Publikation: Specific Heat in Two-Dimensional Melting
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2014
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Physical Review Letters. 2014, 113(12). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.113.127801
Zusammenfassung
We report the specific heat around the melting transition(s) of micrometer-sized superparamagnetic particles confined in two dimensions, calculated from fluctuations of positions and internal energy, and corresponding Monte Carlo simulations. Since colloidal systems provide single particle resolution, they offer the unique possibility to compare the experimental temperatures of peak position and symmetry breaking, respectively. While order parameter correlation functions confirm the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) melting scenario where translational and orientational order symmetries are broken at different temperatures with an intermediate so called hexatic phase, we observe a single peak of the specific heat within the hexatic phase, with excellent agreement between experiment and simulation. Thus, the peak is not associated with broken symmetries but can be explained with the total defect density, which correlates with the maximum increase of isolated dislocations. The absence of a latent heat strongly supports the continuous character of both transitions.
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530 Physik
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heat capacity, colloids, KTHNY
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DEUTSCHLÄNDER, Sven, Antonio M. PUERTAS, Georg MARET, Peter KEIM, 2014. Specific Heat in Two-Dimensional Melting. In: Physical Review Letters. 2014, 113(12). ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.113.127801BibTex
@article{Deutschlander2014Speci-28999,
year={2014},
doi={10.1103/PhysRevLett.113.127801},
title={Specific Heat in Two-Dimensional Melting},
number={12},
volume={113},
issn={0031-9007},
journal={Physical Review Letters},
author={Deutschländer, Sven and Puertas, Antonio M. and Maret, Georg and Keim, Peter}
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<dcterms:abstract xml:lang="eng">We report the specific heat around the melting transition(s) of micrometer-sized superparamagnetic particles confined in two dimensions, calculated from fluctuations of positions and internal energy, and corresponding Monte Carlo simulations. Since colloidal systems provide single particle resolution, they offer the unique possibility to compare the experimental temperatures of peak position and symmetry breaking, respectively. While order parameter correlation functions confirm the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) melting scenario where translational and orientational order symmetries are broken at different temperatures with an intermediate so called hexatic phase, we observe a single peak of the specific heat within the hexatic phase, with excellent agreement between experiment and simulation. Thus, the peak is not associated with broken symmetries but can be explained with the total defect density, which correlates with the maximum increase of isolated dislocations. The absence of a latent heat strongly supports the continuous character of both transitions.</dcterms:abstract>
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