Coexistence of competing orders with two energy gaps in real and momentum space in the high temperature superconductor Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}.
Through a combined scanning tunneling microscopy and angle-resolved photoemission spectroscopy study, we report the observation of two distinct gaps (a small and a large gap) that coexist both in real space and in the antinodal region of momentum space, below the superconducting transition temperature (T_{c}) of Bi_{2}Sr_{2-x}La_{x}CuO_{6+delta}. We show that the small gap is associated with superconductivity. The large-gap persists above T_{c}, and seems linked to observed charge ordering. We find a strong correlation between the large and small gaps suggesting that they are affected by similar physical processes.
Ma
J-H
JH
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA.
Pan
Z-H
ZH
Niestemski
F C
FC
Neupane
M
M
Xu
Y-M
YM
Richard
P
P
Nakayama
K
K
Sato
T
T
Takahashi
T
T
Luo
H-Q
HQ
Fang
L
L
Wen
H-H
HH
Wang
Ziqiang
Z
Ding
H
H
Madhavan
V
V