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Pressure Renormalization for Premelting Phenomena

Author

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  • Grzegorz Wiatrowski

    (Solid State Physics Department, University of Łódź, Pomorska 149/153, 90-236 Łódź, Poland)

  • Leszek Wojtczak

    (Solid State Physics Department, University of Łódź, Pomorska 149/153, 90-236 Łódź, Poland)

Abstract

We develop the pressure renormalization of a phonon potential for atoms interacting anharmonically, starting from a fully dynamical Hamiltonian description in pseudoharmonic approximation. We derive a generalized equation for the correlation function of atom–atom displacement across a thin film, which under certain conditions reduces to the one previously discussed in the literature. Our theory yields expressions for a series of melting temperatures in terms of the microscopic parameters of a layered system using Lindemann's argument. The global instability temperature is obtained due to the distribution of displacement correlations in the surface region while the local melting transition is recognized as a process of surface premelting which expands into the stable bulk with increasing temperature. The pressure dependencies of instability and premelting temperatures are mainly discussed.

Suggested Citation

  • Grzegorz Wiatrowski & Leszek Wojtczak, 1998. "Pressure Renormalization for Premelting Phenomena," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 5(02), pages 479-491.
    • Handle: RePEc:wsi:srlxxx:v:05:y:1998:i:02:n:s0218625x98000852
    DOI: 10.1142/S0218625X98000852
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