Mean-field model for the Curie-Weiss temperature dependence of coherence length in metallic liquids
Autor: | Charles K. C. Lieou, Takeshi Egami |
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Rok vydání: | 2022 |
Předmět: |
Condensed Matter - Materials Science
Statistical Mechanics (cond-mat.stat-mech) Condensed Matter - Mesoscale and Nanoscale Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Soft Condensed Matter (cond-mat.soft) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Condensed Matter::Strongly Correlated Electrons Disordered Systems and Neural Networks (cond-mat.dis-nn) Condensed Matter - Soft Condensed Matter Condensed Matter - Disordered Systems and Neural Networks Condensed Matter - Statistical Mechanics |
Zdroj: | Physical review. E. 105(4-1) |
ISSN: | 2470-0053 |
Popis: | The coherence length of the medium-range order (MRO) in metallic liquids is known to display a Curie-Weiss temperature dependence; its inverse is linearly related to temperature, and when extrapolated from temperatures above the glass transition, the coherence length diverges at a negative temperature with a critical exponent of unity. We propose a mean-field pseudospin model that explains this behavior. Specifically, we model the atoms and their local environment as Ising spins with antiferromagnetic exchange interactions. We further superimpose an exchange interaction between dynamical heterogeneities, or clusters of atoms undergoing cooperative motion. The coherence length in the metallic liquid is thus the correlation length between dynamical heterogeneities. Our results reaffirm the idea that the MRO coherence length is a measure of point-to-set correlations, and that local frustrations in the interatomic interactions are prominent in metallic liquids. |
Databáze: | OpenAIRE |
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