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  Thermalized connectivity networks of jammed packings.

Buss, C., Heussinger, C., & Hallatschek, O. (2016). Thermalized connectivity networks of jammed packings. Soft Matter, 12(36), 7682-7687. doi:10.1039/C6SM00864J.

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 Urheber:
Buss, Clemens1, Autor           
Heussinger, C., Autor
Hallatschek, Oskar1, Autor           
Affiliations:
1Max Planck Research Group Biological Physics and Evolutionary Dynamics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063291              

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 Zusammenfassung: Jammed packings of repulsive elastic spheres have emerged as a rich model system within which elastic properties of disordered glassy materials may be elucidated. Most of the work on these packings have focused on the case of vanishing temperature. Here, we explore the elastic properties of the associated connectivity network for finite temperatures, ignoring the breaking of bonds and the formation of new ones. Using extensive Monte Carlo simulations, we find that, as the temperature is increased, the resulting spring network shrinks and exhibits a rapidly softening bulk modulus via a cusp. Moreover, the shear modulus stiffens in a fixed volume ensemble but not in a fixed pressure ensemble. These counter-intuitive behaviors may be understood from the characteristic spectrum of soft modes near isostaticity, which resembles the spectrum of a rod near its buckling instability. Our results suggest a generic mechanism for negative thermal expansion coefficients in marginal solids. We discuss the consequences of bond breaking and an apparent analogy between thermalization and shear.

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Sprache(n): eng - English
 Datum: 2016-07-062016-09-28
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1039/C6SM00864J
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Titel: Soft Matter
Genre der Quelle: Zeitschrift
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Seiten: - Band / Heft: 12 (36) Artikelnummer: - Start- / Endseite: 7682 - 7687 Identifikator: ISSN: 1744-683X