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Non-adiabatic effects in the phonon dispersion of Mg 1--x Al x B 2 | | Matteo D'Astuto
; Rolf Heid
; Burkhard Renker
; Frank Weber
; Helmut Schober
; De La Pena Seaman Omar
; Janusz Karpinski
; N. D. Zhigadlo
; Alexei Bossak
; Michael Krisch
; | | Date: |
22 Dec 2015 | | Abstract: | Superconducting MgB 2 shows an E 2g zone center phonon, as measured by Raman,
that is very broad in energy and temperature dependent. The Raman shift and
lifetime show large difference with the value elsewhere in the Brillouin Zone
as measured by Inelastic X-ray Scattering (IXS), where its dispersion can be
accounted for by standard harmonic phonon theory, adding only a moderate
electron-phonon coupling. Here we show that the effects rapidly disappear when
electron-phonon coupling is switched off by Al substitution on the Mg sites.
Moreover, using IXS with very high wave-vector resolution in MgB 2 , we can
follow the dispersion connecting the Raman and the IXS signal, in agreement
with a theory using only electron-phonon coupling but without strong anharmonic
terms. The observation is important to understand the effects of
electron-phonon coupling on zone center phonons modes in MgB 2 , but also in
all metals characterized by a small Fermi velocity in a particular direction,
typical for layered compounds. | | Source: | arXiv, 1512.7065 | | Services: | Forum | Review | PDF | Favorites | |
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