Observation of low energy dispersive modes in un- derdoped (La, Nd) 2--x Sr x CuO 4

Matteo D 'Astuto, Sylvain Denis, Jeff Graf +10

We find excitations lower in energy than known phonon modes in underdoped La$\_2-x$Sr$\_x$CuO$\_4+\delta$ (x=0.08), with both inelastic X-Ray scattering (IXS) and inelastic neutron…