Phonon raman linewidth in correlated metals

Verma, A. K. ; Gaitonde, D. M. ; Rao, R. S. ; Godwal, B. K. (2004) Phonon raman linewidth in correlated metals Physica B: Condensed Matter, 353 (3-4). pp. 201-204. ISSN 0921-4526

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We calculate the phonon linewidth of a Raman-active zone centre phonon in a correlated metal. The correlated metal is described by the half-filled single-band Hubbard model on a hypercubic lattice in d=∞ . The electronic self-energy and Green function are determined within the dynamical mean field theory (DMFT) for various values of U in the metallic regime and then used to calculate the phonon linewidth. We consider only the lowest order contribution corresponding to a process in which the phonon decays into a particle-hole pair. At weak correlation we find that the electronic contribution to the phonon linewidth is negligibly small but it grows with increasing correlation strength and then reaches a maximum before showing a decrease.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Correlated Electrons; Phonons; Raman Scattering
ID Code:11755
Deposited On:13 Nov 2010 13:56
Last Modified:02 Jun 2011 08:48

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