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Phys. Rev. B 64, 220507(R) (2001) [4 pages]

Chemical potential shift in Nd2-xCexCuO4: Contrasting behavior between the electron- and hole-doped cuprates

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N. Harima, J. Matsuno, and A. Fujimori
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

Y. Onose, Y. Taguchi, and Y. Tokura
Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan

Received 23 July 2001; revised 8 October 2001; published 26 November 2001

We have studied the chemical potential shift in the electron-doped superconductor Nd2-xCexCuO4 by precise measurements of core-level photoemission spectra. The result shows that the chemical potential monotonously increases with electron doping, quite differently from La2-xSrxCuO4, where the shift is suppressed in the underdoped region. If the suppression of the shift in La2-xSrxCuO4 is attributed to strong stripe fluctuations, the monotonous increase of the chemical potential is consistent with the absence of stripe fluctuations in Nd2-xCexCuO4. The chemical potential jump between Nd2CuO4 and La2CuO4 is suggested to be much smaller than the optical band gaps.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.220507
DOI:
10.1103/PhysRevB.64.220507
PACS:
74.72.Jt, 79.60.Bm, 71.30.+h, 75.50.Ee
 
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