Nodal quasiparticles and antinodal charge ordering in Ca2-xNaxCuO2Cl2 |
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| Authors: | Shen Kyle M Ronning F Lu D H Baumberger F Ingle N J C Lee W S Meevasana W Kohsaka Y Azuma M Takano M Takagi H Shen Z-X |
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| Institution: | Departments of Applied Physics, Physics, and Stanford Synchrotron Laboratory, Stanford University, Stanford, CA 94305, USA. |
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| Abstract: | 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. |
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