Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator

Details Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator Anisotropic softening of collective charge modes in the vicinity of critical doping in a doped Mott insulator

2007-04-24

arxiv.org/abs/0704.3111v1

Phys. Rev. B 78, 073104 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages + 5 Figures

Scientific paper

10.1103/PhysRevB.78.073104

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 Nd$_{2-x}$Ce$_x$CuO$_4$. 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 (\pi,\pi)-direction, whereas the modes exhibit broadening ($\sim$ 1 eV) with relatively little softening along Gamma to (\pi,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.

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