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Infrared properties of La(Ca,Sr)CaCuO single crystals
N. L. Wang, P. Zheng, T. Feng +5
The in-plane optical properties of two crystals of the bilayer cuprate \LSxCCO, one with excess Ca and and the other with Sr and , were investigated over the frequ…
Oxygen Phonon Branches in Detwinned YBa2Cu3O7
D. Reznik, L. Pintschovius, W. Reichardt +6
We report results of inelastic neutron scattering measurements of phonon dispersions on a detwinned sample of YBaCu3O7 and compare them with model calculations. Plane oxygen bond s…
Effect of a magnetic field on the spin- and charge-density wave order in La1.45Nd0.4Sr0.15CuO4
S. Wakimoto, R. J. Birgeneau, Y. Fujimaki +9
The spin-density wave (SDW) and charge-density wave (CDW) order in superconducting La1.45Nd0.4Sr0.15CuO4 were studied under an applied magnetic field using neutron and X-ray diffra…
Transmission-electron-microscopy study of charge-stripe order in La(1.725)Sr(0.275)NiO(4)
Jianqi Li, Yimei Zhu, J. M. Tranquada +2
We characterize the local structure and correlations of charge stripes in La(1.725)Sr(0.275)NiO(4) using transmission-electron microscopy. We present direct evidence that the strip…
Mid-Infrared Conductivity from Mid-Gap States Associated with Charge Stripes
C. C. Homes, J. M. Tranquada, Q. Li +2
The optical conductivity of La(2-x)Sr(x)NiO(4) has been interpreted in various ways, but so far the proposed interpretations have neglected the fact that the holes doped into the N…
High-Energy Spin Dynamics in LaSrNiO
P. Bourges, Y. Sidis, M. Braden +2
We have mapped out the spin dynamics in a stripe-ordered nickelate, LaSrNiO with , using inelastic neutron scattering. We observe spin-wave excit…