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Related Experiment Video

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Evaluation of Auditory Brainstem Response in Chicken Hatchlings

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Aubry transition with small distortions.

O Cépas¹, P Quémerais¹

¹<a href="https://ror.org/04dbzz632">Institut Néel</a>, CNRS, Université Grenoble Alpes, Grenoble 38000, France.

Physical Review. E

|November 20, 2024

Summary

This summary is machine-generated.

The Aubry transition in distorted structures can occur with small distortions, contrary to the Frenkel-Kontorova model. Modifying potential nonlinearities allows this transition, explaining pinned phases in charge-density waves.

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Area of Science:

Condensed Matter Physics
Materials Science

Background:

The Aubry transition describes structural phase transitions in incommensurately distorted systems.
The standard Frenkel-Kontorova model suggests large distortion amplitudes are necessary for this transition.

Purpose of the Study:

To investigate the conditions under which the Aubry transition occurs in incommensurately distorted structures.
To reconcile theoretical models with experimental observations of pinned phases in charge-density waves.

Main Methods:

Modification of the potential shape to increase local mechanical force (nonlinearities).
Analysis of the resulting changes in distortion amplitude and spectral properties (phonon and phason).

Main Results:

The Aubry transition can occur with small distortion amplitudes when potential nonlinearities are increased.
A phason gap opens during the transition.
The phonon spectrum at higher energies remains similar to undistorted systems.

Conclusions:

The Frenkel-Kontorova model's prediction of large distortion amplitudes is not universally applicable.
Increased potential nonlinearities provide a mechanism for the Aubry transition at small amplitudes.
This model explains experimentally observed pinned phases with minimal distortions in charge-density waves.