Abstract
High resolution angle-resolved photoemission measurements on an underdoped
(La2-xSrx)CuO4 system show that, at energies below 70 meV, the quasiparticle
peak is well defined around the (π/2,π/2) nodal region and disappears
rather abruptly when the momentum is changed from the nodal point
to the (π,0) antinodal point along the underlying “Fermi surface.”
It indicates that there is an extra low energy scattering mechanism
acting upon the antinodal quasiparticles. We propose that this mechanism
is the scattering of quasiparticles across the nearly parallel segments
of the Fermi surface near the antinodes.
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