Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS

Details Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS Mott gap excitations in twin-free YBa2Cu3O7-d (Tc = 93 K) studied by RIXS

2004-09-18

arxiv.org/abs/cond-mat/0409477v1

Phys. Rev. Lett. 94, 187002 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevLett.94.187002

Mott gap excitations in the high-Tc superconductor of the optimal doped YBa2Cu3O7-d (Tc = 93 K) have been studied by the resonant inelastic x-ray scattering method. Anisotropic spectra in the ab-plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the b* direction, while the excitation from the CuO2 plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculation based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra by taking the different parameters of the on-site Coulomb energy. The fact of the Mott gap of the CuO chain site is much smaller than that of CuO2 plane site is observed for the first time.

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