For the fcc metals Cu, Ag, Au, and Al, a theoretical analysis has been made of the one-phonon linewidth due to cubic anharmonic interactions. Third-order central and angular force constants have been obtained by using the symmetry properties of the lattice to relate the force constants with the experimental third-order elastic moduli. The convergence of the value of the nearest-neighbor third-order force constant has been studied as a function of the range of the cubic interactions. We have found that for metals for which the third-order Cauchy relations are violated it is necessary to introduce cubic angular forces to obtain a convergent value of the nearest-neighbor force constant. For Al and Cu the evaluated linewidths are compared with experimental data.

Anharmonic Damping of Phonon Modes in the Face-Centered Cubic Metals / M., Zoli; Santoro, Giorgio; Bortolani, Virginio; A. A., Maradudin; R. F., Wallis. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 41(1990), pp. 7507-7514.

Anharmonic Damping of Phonon Modes in the Face-Centered Cubic Metals

SANTORO, Giorgio;BORTOLANI, Virginio;
1990

Abstract

For the fcc metals Cu, Ag, Au, and Al, a theoretical analysis has been made of the one-phonon linewidth due to cubic anharmonic interactions. Third-order central and angular force constants have been obtained by using the symmetry properties of the lattice to relate the force constants with the experimental third-order elastic moduli. The convergence of the value of the nearest-neighbor third-order force constant has been studied as a function of the range of the cubic interactions. We have found that for metals for which the third-order Cauchy relations are violated it is necessary to introduce cubic angular forces to obtain a convergent value of the nearest-neighbor force constant. For Al and Cu the evaluated linewidths are compared with experimental data.
41
7507
7514
Anharmonic Damping of Phonon Modes in the Face-Centered Cubic Metals / M., Zoli; Santoro, Giorgio; Bortolani, Virginio; A. A., Maradudin; R. F., Wallis. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 41(1990), pp. 7507-7514.
M., Zoli; Santoro, Giorgio; Bortolani, Virginio; A. A., Maradudin; R. F., Wallis
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/458931
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