scholarly journals An energy-landscape-based crossover temperature in glass-forming liquids

2020 ◽  
Vol 153 (24) ◽  
pp. 241101
Author(s):  
Karina González-López ◽  
Edan Lerner
Keyword(s):  
Energy Landscape ◽  
Crossover Temperature ◽  
Glass Forming

Signatures of distinct dynamical regimes in the energy landscape of a glass-forming liquid

Nature ◽  
10.1038/31189 ◽  
1998 ◽  
Vol 393 (6685) ◽  
pp. 554-557 ◽  
Author(s):  
Srikanth Sastry ◽  
Pablo G. Debenedetti ◽  
Frank H. Stillinger
Keyword(s):  
Energy Landscape ◽  
Glass Forming ◽  
Dynamical Regimes

Rheology and Ultrasonic Properties of Metallic Glass-Forming Liquids: A Potential Energy Landscape Perspective

MRS Bulletin ◽  
2007 ◽  
Vol 32 (8) ◽  
pp. 644-650 ◽  
Author(s):  
William L. Johnson ◽  
Marios D. Demetriou ◽  
John S. Harmon ◽  
Mary L. Lind ◽  
Konrad Samwer
Keyword(s):  
Metallic Glass ◽  
Shear Modulus ◽  
Potential Energy ◽  
Energy Landscape ◽  
Saddle Points ◽  
Functional Relation ◽  
Thermal Excitation ◽  
Liquid Region ◽  
Glass Forming ◽  
Potential Energy Landscape

AbstractIn the potential energy landscape theory of liquids, the energetic configurational landscape of a liquid is modeled using a potential energy function comprising a population of stable potential energy minima called inherent states, which represent the stable atomic configurations of the liquid. These configurations are separated by saddle points that represent barriers for configurational hopping between the inherent states. In this article, we survey recent progress in understanding metallic glass-forming liquids from a potential energy landscape perspective. Flow is modeled as activated hopping between inherent states across energy barriers that are assumed to be, on average, sinusoidal. This treatment gives rise to a functional relation between viscosity and isoconfigurational shear modulus, leading to rheological laws describing the Newtonian and non-Newtonian viscosity of metallic glass-forming liquids over a broad range of rheological behavior. High-frequency ultrasonic data gathered within the supercooled-liquid region are shown to correlate well with rheological data, thus confirming the validity of the proposed treatment. Variations in shear modulus induced either by thermal excitation or mechanical deformation can be correlated to variations in the measured stored enthalpy or equivalently to the configurational potential energy of the liquid. This shows that the elastic and rheological properties of a liquid or glass are uniquely related to the average potential energy of the occupied inherent states.

scholarly journals Crossover to potential energy landscape dominated dynamics in a model glass-forming liquid

2000 ◽  
Vol 112 (22) ◽  
pp. 9834-9840 ◽  
Author(s):  
Thomas B. Schrøder ◽  
Srikanth Sastry ◽  
Jeppe C. Dyre ◽  
Sharon C. Glotzer
Keyword(s):  
Potential Energy ◽  
Energy Landscape ◽  
Glass Forming ◽  
Model Glass ◽  
Potential Energy Landscape

scholarly journals A localization transition underlies the mode-coupling crossover of glasses

2019 ◽  
Vol 7 (6) ◽  
Author(s):  
Daniele Coslovich ◽  
Andrea Ninarello ◽  
Ludovic Berthier
Keyword(s):  
Mode Coupling ◽  
Characteristic Temperature ◽  
Energy Landscape ◽  
Mean Field ◽  
Real Space ◽  
Stationary Points ◽  
Crossover Temperature ◽  
Localization Transition ◽  
Finite Dimensional ◽  
Potential Energy Landscape

We study the equilibrium statistical properties of the potential energy landscape of several glass models in a temperature regime so far inaccessible to computer simulations. We show that unstable modes of the stationary points undergo a localization transition in real space close to the mode-coupling crossover temperature determined from the dynamics. The concentration of localized unstable modes found at low temperature is a non-universal, finite dimensional feature not captured by mean-field glass theory. Our analysis reconciles, and considerably expands, previous conflicting numerical results and provides a characteristic temperature for glassy dynamics that unambiguously locates the mode-coupling crossover.

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