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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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A universal dimensionless length scale in medium range order amorphous structures.

Pragya Shukla1

  • 1Department of Physics, Indian Institute of Technology, Kharagpur-721302, W.B., India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 23, 2022
PubMed
Summary
This summary is machine-generated.

A new dimensionless length scale in amorphous systems arises from molecular forces and phonon coupling. This scale explains universal behaviors in properties like specific heat and internal friction at low temperatures.

Keywords:
dimensionlesslengthmediumrangescaleuniversal

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Statistical Mechanics

Background:

  • Amorphous systems exhibit complex structures and universal properties at low temperatures.
  • Understanding the microscopic origins of these universalities is a key challenge.

Purpose of the Study:

  • To identify a fundamental length scale governing the low-temperature universalities in amorphous systems.
  • To elucidate the microscopic mechanisms responsible for this length scale.

Main Methods:

  • Theoretical analysis of amorphous systems.
  • Investigating the interplay between intermolecular dispersion forces and phonon-mediated coupling.

Main Results:

  • Discovery of a novel dimensionless length scale.
  • This scale is a ratio of medium and short-range order structures.
  • The scale originates from a synergy between dispersion forces and phonon coupling.

Conclusions:

  • The identified length scale provides a unifying framework for understanding various low-temperature universalities.
  • It explains phenomena such as specific heat, internal friction, boson peak, and Meissner-Berret ratio variations.