Shadow bands in overdoped Bi2Sr2CaCu2O8+x
We performed angle-resolved photoemission experiments on overdoped single crystal Bi2Sr2CaCu2O8+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). (C) 1997 Published by Elsevier Science Ltd.
Keywords: RANGE ANTIFERROMAGNETIC CORRELATIONS ; 2-DIMENSIONAL HUBBARD-MODEL ; QUASI-PARTICLE DISPERSION ; FERMI-SURFACE ; SPIN-GAP ; PHOTOEMISSION ; COEXISTENCE ; METALLICITY ; PHASE ; SUPERCONDUCTIVITY
Univ wisconsin,dept phys,madison,wi 53706. usn,res lab,washington,dc 20375. pl kapitsa phys problems inst,moscow,russia. LaRosa, S, ECOLE POLYTECH FED LAUSANNE,INST PHYS APPL,CH-1015 LAUSANNE,SWITZERLAND.
ISI Document Delivery No.: YD684
Record created on 2006-10-03, modified on 2016-08-08