  We use angle-resolved photoemission spectroscopy (ARPES) to investigate the
properties of the energy gap(s) in optimally doped (Bi,Pb)2(Sr,La)2CuO6+d
(Bi2201). We find that the spectral gap has two components in the
superconducting state: a superconducting gap and pseudogap. Significant
differences in their momentum and temperature dependence suggest that they
represent two separate energy scales. Spectra near the node reveal a sharp peak
with a small gap below Tc that closes at Tc. Near the antinode, the spectra are
broad with a large energy gap of ~40meV above and below Tc. The spectral shape
and gap magnitude around the antinode are almost constant across Tc, which
indicates that the pseudogap state coexists with the superconducting state
below Tc, and it dominates the character of the spectra around the antinode. We
speculate that the pseudogap state competes with the superconductivity by
diminishing spectral weight in the antinodal regions, where the magnitude of
the superconducting gap is largest.
