Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8

Details Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8 Evidence for an energy scale for quasiparticle dispersion in Bi_2Sr_2CaCu_2O_8

2000-04-20

arxiv.org/abs/cond-mat/0004349v1

Physics

Condensed Matter

4 figures

Scientific paper

10.1103/PhysRevLett.85.2581

Quasiparticle dispersion in $Bi_{2}Sr_{2}CaCu_{2}O_{8}$ 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 $50\pm10$ $meV$ binding energy where the velocity changes by a factor of two 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.

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