Evidence for Dynamic Phase Separation and High Energy Spin Dynamics in underdoped La₂₋ₓSrₓCuO₄ from Resonant Inelastic X-Ray Scattering
Braicovich, L. · Brink, J. van den · Bisogni, V. · Sala, M. Moretti · Ament, L. J. P. · Brookes, N. B. · De Luca, G. M. · Salluzzo, M. · Schmitt, T. · Ghiringhelli, G.
Original · EN
We probe the collective magnetic modes of La₂CuO₄ (LCO) and underdoped La₂₋ₓSrₓCuO₄ (LSCO) by momentum resolved Resonant Inelastic X-ray Scattering (RIXS) at the Cu L₃ 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 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.
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