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Melting as an Instability of Crystal Structure with respect to Transverse Acoustic Wave, Quasi-Harmonic Approach

100%

Czachor A.

Acta Physica Polonica A

2012

vol. 122

issue 2

365-369

It is suggested that the precursor of melting in some crystals can be a macroscopic shear deformation such as the transverse sound wave. This hypothesis is examined basing on the quasi-harmonic approach to lattice dynamics within the two-body ion-ion concept of interaction in metals. One finds that due to the temperature induced modification of effective ion-ion interaction appearing in the quasi-harmonic approximation the crystal ceases to support propagation of transverse sound waves when its temperature approaches a certain critical temperature T_{cr}, understood here to be the melting temperature T_{m}.

Study of Two-Dimensional Melting in a System of Small Magnets

51%

Šviková M., Liščinský M., Rabatin P., Géci M.

Acta Physica Polonica A

2014

vol. 126

issue 1

258-259

Using video tracking we study configurational and melting properties of a finite number (64) of 6 mm sized disc magnets moving on an air layer produced by an air table to imitate two-dimensional (2D) crystal. It is shown that velocity of air flow allows us to influence temperature. Analysing trajectories of particles has shown the transition from hexagonal to square lattice and after it to liquid phase with underlying square shell structure.

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2 Acta Physica Polonica A

1 2014

1 2012

1 Czachor A.

1 Géci M.

1 Liščinský M.

1 Rabatin P.

1 Šviková M.

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Melting as an Instability of Crystal Structure with respect to Transverse Acoustic Wave, Quasi-Harmonic Approach

Study of Two-Dimensional Melting in a System of Small Magnets