Shadow bands in overdoped Bi_2Sr_2CaCu_2O_{8+x}

Details Shadow bands in overdoped Bi_2Sr_2CaCu_2O_{8+x} Shadow bands in overdoped Bi_2Sr_2CaCu_2O_{8+x}

1995-12-18

arxiv.org/abs/cond-mat/9512132v1

Physics

Condensed Matter

11 pages, 5 figures are available upon request

Scientific paper

We performed angle-resolved photoemission experiments on overdoped single crystal $Bi_2Sr_2CaCu_2O_{8+x}$ samples with Tc values as low as 55K and very narrow transitions as measured by AC susceptibility. The photoemission data indicate the presence of a ``shadow'' peak in the quasiparticle spectral function $A(\omega)$ shifted by $(\pi,\pi)$ from the conventional quasiparticle peak. The ratio of the shadow/quasiparticle peak amplitudes strongly increases with the binding energy. This is consistent with the idea that the shadow peak is not a structural replica of the quasiparticle peak, but rather a maximum in a spectral function which can exist due to interaction with spin fluctuations peaked at $(\pi,\pi)$.

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