Visualizing antinodal pair decoherence in a high T$_{\mathrm{c}}$ cuprate

The relationship between the pseudogap phase and superconductivity in the cuprate superconductors remains mysterious. We use Fourier transform scanning tunneling spectroscopy to study the pseudogap in the cuprate superconductor Bi$_{\mathrm{2-x}}$Pb$_{\mathrm{x}}$Sr$_{2}$CuO$_{\mathrm{6+\delta}}$. We discover a new type of quasiparticle interference in the antinodal regions, presumed to be dominated by the pseudogap. Magnetic field induced spectral weight transfer shows that the pseudogap suppresses superconducting coherence but does not affect d-wave pairing at the antinode.