Chemical Potential Shift in Nd${}_{2-x}$Ce${}_x$CuO${}_4$: Contrasting Behaviors of the Electron- and Hole-Doped Cuprates

Abstract

We have studied the chemical potential shift in the electron-doped superconductor Nd${}_{2-x}$Ce${}_x$CuO${}_4$ by precise measurements of core-level photoemission spectra. The result shows that the chemical potential monotonously increases with electron doping, quite differently from La${}_{2-x}$Sr${}_x$CuO${}_4$, where the shift is suppressed in the underdoped region. If the suppression of the shift in La${}_{2-x}$Sr${}_x$CuO${}_4$ is attributed to strong stripe fluctuations, the monotonous increase of the chemical potential is consistent with the absence of stripe fluctuations in Nd${}_{2-x}$Ce${}_x$CuO${}_4$. The chemical potential jump between Nd${}_2$CuO${}_4$ and La${}_2$CuO${}_4$ is found to be much smaller than the optical band gaps.

4 pages, 5 figures

References in corpus (1)

• Electronic Structure of Mott Insulators Studied by Inelastic X-ray Scattering

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