Chemical potential shift in lightly doped to optimally doped Ca_2–xNa_xCuO₂Cl₂

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H. Yagi, T. Yoshida, and A. Fujimori
Department of Physics and Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

Y. Kohsaka
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan and LASSP, Department of Physics, Cornell University, Ithaca, New York 14853, USA

M. Misawa, T. Sasagawa, and H. Takagi
Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8561, Japan

M. Azuma and M. Takano
Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan

Received 5 October 2005; revised 22 March 2006; published 16 May 2006

Wehave deduced the chemical potential shift Delta µ in the high-T_csuperconductor Ca_2–xNa_xCuO₂Cl₂ (Na-CCOC) using core-level x-ray photoemission spectroscopy. The derived Delta µ is rigid-band-like, and almost linear in hole concentration x,quantitatively consistent with the shift estimated from a recent angleresolved photoemission spectroscopy study. Also, Delta µ in Na-CCOC is muchlarger than that in La_2–xSr_xCuO₄ (LSCO) and as large asthat in Bi₂Sr₂CaCu₂O_8+y. Qualitatively different behavior of Delta µ between Na-CCOCand LSCO is discussed in relation to the different behaviorsof charge ordering.

URL:	http://link.aps.org/doi/10.1103/PhysRevB.73.172503
DOI:	10.1103/PhysRevB.73.172503
PACS:	74.25.Jb; 74.72.Jt; 79.60.-i 74.25.Jb Electronic structure of superconductors 74.72.Jt Other cuprates, including Tl and Hg-based cuprates (HTSC) 79.60.-i Photoemission and photoelectron spectra (condensed matter) YEAR: 2006
KEYWORDS:	calcium compounds, sodium compounds, high-temperature superconductors, chemical potential, X-ray photoelectron spectra, hole density

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