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Direct Observation of Entropic Stabilization of bcc Crystals Near Melting


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Publication Date: 2017-02-23

Journal Title: Physical Review Letters

Publisher: American Physical Society

Volume: 118

Number: 088003

Language: English

Type: Article

This Version: AM

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Citation: Sprakel, J., Zaccone, A., Spaepen, F., Schall, P., & Weitz, D. (2017). Direct Observation of Entropic Stabilization of bcc Crystals Near Melting. Physical Review Letters, 118 (088003)https://doi.org/10.1103/PhysRevLett.118.088003

Abstract: Crystals with low latent heat are predicted to melt from an entropically stabilized body-centered cubic symmetry. At this weakly first-order transition, strongly correlated fluctuations are expected to emerge, which could change the nature of the transition. Here we show how large fluctuations stabilize bcc crystals formed from charged colloids, giving rise to strongly power-law correlated heterogeneous dynamics. Moreover, we find that significant nonaffine particle displacements lead to a vanishing of the nonaffine shear modulus at the transition. We interpret these observations by reformulating the Born-Huang theory to account for nonaffinity, illustrating a scenario of ordered solids reaching a state where classical lattice dynamics fail.

Sponsorship: This work was supported by the National Science Foundation (DMR-1310266, DMR-1206765), the Harvard Materials Research Science and Engineering Center (DMR-1420570), and NASA (NNX13AQ48G).

Identifiers:

External DOI: https://doi.org/10.1103/PhysRevLett.118.088003

This record's URL: https://www.repository.cam.ac.uk/handle/1810/263709



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Autor: Sprakel, JZaccone, ASpaepen, FSchall, PWeitz, DA

Fuente: https://www.repository.cam.ac.uk/handle/1810/263709



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