title: Nodal quasiparticles and antinodal charge ordering in Ca2-xNaxCuO2Cl2.
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.
authors.affiliation: Departments of Applied Physics, Physics, and Stanford Synchrotron Laboratory, Stanford University, Stanford, CA 94305, USA.
authors.forename: Kyle M
authors.initials: KM
authors.lastname: Shen
authors.forename: F
authors.initials: F
authors.lastname: Ronning
authors.forename: D H
authors.initials: DH
authors.lastname: Lu
authors.forename: F
authors.initials: F
authors.lastname: Baumberger
authors.forename: N J C
authors.initials: NJ
authors.lastname: Ingle
authors.forename: W S
authors.initials: WS
authors.lastname: Lee
authors.forename: W
authors.initials: W
authors.lastname: Meevasana
authors.forename: Y
authors.initials: Y
authors.lastname: Kohsaka
authors.forename: M
authors.initials: M
authors.lastname: Azuma
authors.forename: M
authors.initials: M
authors.lastname: Takano
authors.forename: H
authors.initials: H
authors.lastname: Takagi
authors.forename: Z-X
authors.initials: ZX
authors.lastname: Shen