47 research outputs found
Spatial Analysis ofLobesia botrana(Lepidoptera: Tortricidae) Male Population in a Mediterranean Agricultural Landscape in Central Italy
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Optimisation of the lipase-catalysed preparation of a nucleoside prodrug model using an experimental design methodology
Evolution of plasmon excitations across the phase diagram of the cuprate superconductor LaSrCuO
We use resonant inelastic x-ray scattering (RIXS) at the O - and Cu
-edges to investigate the doping- and temperature dependence of low-energy
plasmon excitations in LaSrCuO. We observe a monotonic
increase of the energy scale of the plasmons with increasing doping in the
underdoped regime, whereas a saturation occurs above optimal doping and persists at least up to . Furthermore, we find that the
plasmon excitations show only a marginal temperature dependence, and possible
effects due to the superconducting transition and the onset of strange metal
behavior are either absent or below the detection limit of our experiment.
Taking into account the strongly correlated character of the cuprates, we show
that layered -- model calculations accurately capture the increase of
the plasmon energy in the underdoped regime. However, the computed plasmon
energy continues to increase even for doping levels above ,
which is distinct from the experimentally observed saturation, and reaches a
broad maximum around . We discuss whether possible lattice disorder
in overdoped samples, a renormalization of the electronic correlation strength
at high dopings, or an increasing relevance of non-planar Cu and O orbitals
could be responsible for the discrepancy between experiment and theory for
doping levels above .Comment: 19 pages, 11 figure