We have measured the lattice dynamics of underdoped La2−xSrxCuO4+δ (x=0.08) using high resolution inelastic x-ray scattering spectroscopy. The very good intrinsic Q resolution of this experiment allows us to differentiate between the two proposed scenarios for the Cu-O bond stretching phonon broadening reported at q=(0.25,0,0). The results suggest that this phonon broadening is due to intrinsic damping rather than to a steep dispersion, having important implications on the interpretation of phonon anomalies in cuprates.
In-plane copper-oxygen bond-stretching mode anomaly in underdoped La$_{2-x}$Sr$_x$CuO$_{4+delta}$ measured with high-resolution inelastic x-ray scattering / J., Graf; M., D'Astuto; P., Giura; A., Shukla; Saini, Naurang Lal; A., Bossak; M., Krisch; S. W., Cheong; T., Sasagawa; A., Lanzara. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 76:(2007), pp. 172507-1-172507-4. [10.1103/PhysRevB.76.172507]
In-plane copper-oxygen bond-stretching mode anomaly in underdoped La$_{2-x}$Sr$_x$CuO$_{4+delta}$ measured with high-resolution inelastic x-ray scattering
SAINI, Naurang Lal;
2007
Abstract
We have measured the lattice dynamics of underdoped La2−xSrxCuO4+δ (x=0.08) using high resolution inelastic x-ray scattering spectroscopy. The very good intrinsic Q resolution of this experiment allows us to differentiate between the two proposed scenarios for the Cu-O bond stretching phonon broadening reported at q=(0.25,0,0). The results suggest that this phonon broadening is due to intrinsic damping rather than to a steep dispersion, having important implications on the interpretation of phonon anomalies in cuprates.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
