ar X iv : c on d - m at / 9 51 21 32 v 1 1 8 D ec 1 99 5 Shadow bands in overdoped Bi
نویسندگان
چکیده
We performed angle-resolved photoemission experiments on overdoped single crystal Bi 2 Sr 2 CaCu 2 O 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(ω) shifted by (π, π) 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 (π, π).
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