Plasmon Dispersion at Large Wave Vectors in Al

P. E. Batson; C. H. Chen; J. Silcox

doi:10.1103/PhysRevLett.37.937

Plasmon Dispersion at Large Wave Vectors in Al

P. E. Batson, C. H. Chen, and J. Silcox

Phys. Rev. Lett. 37, 937 – Published 4 October 1976

Abstract

We report high-precision measurements of electron energy-loss scattering intensity, giving the bulk plasmon dispersion $ω (q)$ for wave vectors extending to $q > q_{F}$ . Some subtleties are identifiable in these data that clarify the effects of multiple scattering. These results are in qualitative agreement with random-phase-approximation concepts, showing smooth dispersion to $2 ω_{p}$ and $1.4 q_{F}$ , where $ω (q)$ joins the center of the quasiparticle continuum, rather than the dispersionless result obtained previously.

Received 1 July 1976

DOI:https://doi.org/10.1103/PhysRevLett.37.937

Authors & Affiliations

P. E. Batson^* and C. H. Chen^*

School of Applied and Engineering Physics and the Materials Science Center, Cornell University, Ithaca, New York 14853

J. Silcox^*,†

Bell Laboratories, Murray Hill, New Jersey 07974
School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853

^*Work at Cornell supported by Advanced Research Projects Agency and National Science Foundation through the Materials Science Center at Cornell University.
^†Present address; resident visitor at Bell Laboratories 1974-1975.