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Science 11 February 2005:
Vol. 307. no. 5711, pp. 901 - 904
DOI: 10.1126/science.1103627
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Reports

Nodal Quasiparticles and Antinodal Charge Ordering in Ca2-xNaxCuO2Cl2

Kyle M. Shen,1 F. Ronning,1* D. H. Lu,1 F. Baumberger,1 N. J. C. Ingle,1 W. S. Lee,1 W. Meevasana,1 Y. Kohsaka,2 M. Azuma,3 M. Takano,3 H. Takagi,2,4 Z.-X. Shen1{dagger}

Understanding the role of competing states in the cuprates is essential for developing a theory for high-temperature superconductivity. We report angle-resolved photoemission spectroscopy experiments which probe the 4a0 x 4a0 charge-ordered state discovered by scanning tunneling microscopy in the lightly doped cuprate superconductor Ca2–xNaxCuO2Cl2. Our measurements reveal a marked dichotomy between the real- and momentum-space probes, for which charge ordering is emphasized in the tunneling measurements and photoemission is most sensitive to excitations near the node of the d-wave superconducting gap. These results emphasize the importance of momentum anisotropy in determining the complex electronic properties of the cuprates and places strong constraints on theoretical models of the charge-ordered state.

1 Departments of Applied Physics, Physics, and Stanford Synchrotron Laboratory, Stanford University, Stanford, CA 94305, USA.
2 Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277–8561, Japan.
3 Institute for Chemical Research, Kyoto University, Uji, Kyoto 611–0011, Japan.
4 RIKEN, The Institute for Physical and Chemical Research, Wako 351–0198, Japan.

* Present address: Los Alamos National Laboratory, Los Alamos, NM 87545, USA.

{dagger} To whom correspondence should be addressed. E-mail: zxshen{at}stanford.edu

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