Grain-boundary-induced melting in quenched polycrystalline monolayers

Deutschländer, Sven; Boitard, Charlotte; Maret, Georg; Keim, Peter

Grain-boundary-induced melting in quenched polycrystalline monolayers

Dateien

Deutschlaender_0-312961.pdfGröße: 1.01 MBDownloads: 285

Datum

2015

Autor:innen

Deutschländer, Sven

Boitard, Charlotte

Maret, Georg

Keim, Peter

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Physik

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Physical Review E. 2015, 92(6), 060302. ISSN 1539-3755. eISSN 1550-2376. Available under: doi: 10.1103/PhysRevE.92.060302

Zusammenfassung

Melting in two dimensions can successfully be explained with the Kosterlitz-Thouless-Halperin-Nelson-Young (KTHNY) scenario which describes the formation of the high-symmetry phase with the thermal activation of topological defects within an (ideally) infinite monodomain. With all state variables being well defined, it should hold also as freezing scenario where oppositely charged topological defects annihilate. The Kibble-Zurek mechanism, on the other hand, shows that spontaneous symmetry breaking alongside a continuous phase transition cannot support an infinite monodomain but leads to polycrystallinity. For any nonzero cooling rate, critical fluctuations will be frozen out in the vicinity of the transition temperature. This leads to domains with different director of the broken symmetry, separated by a defect structure, e.g., grain boundaries in crystalline systems. After instantaneously quenching a colloidal monolayer from a polycrystalline to the isotropic fluid state, we show that such grain boundaries increase the probability for the formation of dislocations. In addition, we determine the temporal decay of defect core energies during the first few Brownian times after the quench. Despite the fact that the KTHNY scenario describes a continuous phase transition and phase equilibrium does not exist, melting in polycrystalline samples starts at grain boundaries similar to first-order phase transitions.

Fachgebiet (DDC)

530 Physik

Schlagwörter

Colloids; Nonequilibrium and irreversible thermodynamics; Grain and twin boundaries; Solid-liquid transitions

Zitieren

ISO 690

DEUTSCHLÄNDER, Sven, Charlotte BOITARD, Georg MARET, Peter KEIM, 2015. Grain-boundary-induced melting in quenched polycrystalline monolayers. In: Physical Review E. 2015, 92(6), 060302. ISSN 1539-3755. eISSN 1550-2376. Available under: doi: 10.1103/PhysRevE.92.060302

BibTex

@article{Deutschlander2015-12-09Grain-33076,
  year={2015},
  doi={10.1103/PhysRevE.92.060302},
  title={Grain-boundary-induced melting in quenched polycrystalline monolayers},
  number={6},
  volume={92},
  issn={1539-3755},
  journal={Physical Review E},
  author={Deutschländer, Sven and Boitard, Charlotte and Maret, Georg and Keim, Peter},
  note={Article Number: 060302}
}

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