Probing the Coulomb Interaction of PuCoGa5 by Phonon Spectroscopy
The phonon dispersion curves of the unconventional superconductor PuCoGa5 were studied by inelastic X-ray scattering at room temperature. The experimental data agree well with ab initio lattice dynamics calculations. An accurate theoretical description of the phonon spectrum is obtained only when a local Coulomb repulsion U ¿ 3 eV among 5f electrons is taken into account. This implies partial localization of the 5f electrons in this compound. A comparison made with the phonon spectrum of UCoGa5 suggests that the latter compound is better described with a fully itinerant f electrons model.
RAYMOND S.;
PIERKARZ P.;
SANCHEZ J.P.;
SERRANO J.;
KRISCH M.;
DETLEFS B.;
REBIZANT Jean;
METOKI N.;
KANEKO K.;
JOCHYM P.;
OLES A.;
PARLINSKI K.;
2007-09-07
ELSEVIER SCIENCE SA
JRC40070
0925-8388,
https://publications.jrc.ec.europa.eu/repository/handle/JRC40070,
10.1016/j.jallcom.2006.09.053,
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