Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-03
Physics
Condensed Matter
Superconductivity
5 pages, 4 figures
Scientific paper
We probe the collective magnetic modes of La$_2$CuO$_4$ (LCO) and underdoped La$_{2-x}$Sr$_x$CuO$_4$ (LSCO) by momentum resolved Resonant Inelastic X-ray Scattering (RIXS) at the Cu $L_3$ edge. In LCO the single magnon dispersion measured by RIXS coincides with the one determined by inelastic neutron scattering. For LSCO the spin dynamics shows a branch dispersing up to $\sim$400 meV coexisting with a branch at lower energy. Only the latter has been observed with neutrons so far and is considered a key signature of doped cuprates. The presence of the high-energy branch indicates that LSCO is in a dynamic inhomogeneous spin state.
Ament Luuk J. P.
Bisogni V.
Braicovich L.
Brookes Nicholas B.
de Luca G. M.
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