Surprises in the doping dependence of the Fermi surface in Bi(Pb)-2212

Details Surprises in the doping dependence of the Fermi surface in Bi(Pb)-2212 Surprises in the doping dependence of the Fermi surface in Bi(Pb)-2212

2001-04-17

arxiv.org/abs/cond-mat/0104294v1

extended version (cond-mat/0201485) is published in Phys. Rev. B 66, 014502 (2002)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures (revtex)

Scientific paper

A detailed and systematic ARPES investigation of the doping-dependence of the normal state Fermi surface (FS) of modulation-free (Pb,Bi)-2212 is presented. The FS does not change in topology away from hole-like at any stage. The data reveal, in addition, a number of surprises. Firstly the FS area does not follow the usual curve describing Tc vs x for the hole doped cuprates, but is down-shifted in doping by ca. 0.05 holes per Cu site, indicating either the break-down of Luttinger's theorem or the consequences of a significant bi-layer splitting of the FS. Secondly, the strong k-dependence of the FS width is shown to be doping independent. Finally, the relative strength of the shadow FS has a doping dependence mirroring that of Tc.

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