Volume 71, Number 5, September 2005
|Page(s)||776 - 782|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||03 August 2005|
Observation of phonon structure in electron density of states of a normal metal
Department of Physics and Astronomy, McMaster University Hamilton, Ontario, Canada, L8S 4M1
2 Department of Physics, University of Alberta - Edmonton, Alberta, Canada, T6J 2J1
Accepted: 5 July 2005
Within standard treatments of the interacting electron-phonon system the electron density of states (EDOS) shows no sign of the phonons when the system is in the normal state. On the other hand, emergence of a fine energy scale in the superconducting state makes the phonons readily observable in the EDOS and other spectroscopic quantities. Here we wish to re-examine the conditions under which phonon structure might be present in the normal state. Accounting for a finite, i.e. non-infinite, electronic bandwidth results in easily distinguishable phonon structure in the EDOS. We argue that for narrow-band metals, the resolution of photoemission spectroscopy is sufficient for resolving these structures. Manifestations of finite-band effects in are discussed.
PACS: 71.10.Ay – Fermi-liquid theory and other phenomenological models / 71.38.-k – Polarons and electron-phonon interactions / 79.60.-i – Photoemission and photoelectron spectra
© EDP Sciences, 2005
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