Abstract
Quasiparticle dispersion in Bi2Sr2CaCu2O8 is investigated with improved
angular resolution as a function of temperature and doping. Unlike
the linear dispersion predicted by the band calculation, the data
show a sharp break in dispersion at 50±15 meV binding energy where
the velocity changes by a factor of 2 or more. This change provides
an energy scale in the quasiparticle self-energy. This break in dispersion
is evident at and away from the d-wave node line, but the magnitude
of the dispersion change decreases with temperature and with increasing
doping.
Users
Please
log in to take part in the discussion (add own reviews or comments).