Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-04-24
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.
Bansil Arun
Eisaki Hiroshi
Hasan Zahid Md.
Hsieh David
Kaga Y.
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