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