Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator
arXiv:0704.3111 · doi:10.1103/PhysRevB.78.073104
Abstract
Momentum resolved inelastic resonant x-ray scattering is used to map the evolution of charge excitations over a large range of energies, momenta and doping levels in the electron doped Mott insulator class NdCeCuO. As the doping induced AFM-SC (antiferromagnetic-superconducting) transition is approached, we observe an anisotropic softening of collective charge modes over a large energy scale along the Gamma to (π,π)-direction, whereas the modes exhibit broadening ( 1 eV) with relatively little softening along Gamma to (π,0) with respect to the parent Mott insulator (x=0). Our study indicates a systematic collapse of the gap consistent with the scenario that the system dopes uniformly with electrons even though the softening of the modes involves an unusually large energy scale.
arXiv comment5 pages + 5 Figures
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- Renormalization of f-levels away from the Fermi energy in electron excitation spectroscopies: Density functional results of NdCeCuO
- X-ray absorption near-edge spectra of overdoped La_2-xSr_xCuO_4 high-T_c superconductors
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- Lindhard and RPA susceptibility computations in extended momentum space in electron doped cuprates
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- Post-growth annealing effects on charge and spin excitations in NdCeCuO
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