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. © 1990 The American Physical Society.

Anharmonic damping of phonon modes in the fcc metals

ZOLI, Marco;
1990-01-01

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. © 1990 The American Physical Society.
1990
262
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11581/246593
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? ND
social impact