Fermi surface map of the single-layer Bi-cuprate Bi₂Sr_(2-x)La_xCuO_(6+delta) at optimal doping

2001/09/10 by R. Mueller, M. Schneider, C. Janowitz +8
Physics and Astronomy · #cond-mat.supr-con

paper · pdf

published as J. Superconductivity 14, 657 (2001) · 10 pages, 5 figures

arxiv created 2001/09/10 · arxiv updated 2009/11/30

Abstract

A first Fermi surface map of a single-layer high-Tc superconductor is presented. The experiments were carried out on optimally doped Bi₂Sr_(2-x)La_xCuO_(6+delta)(x=0.40) with synchrotron radiation which allow to discuss in detail the strong polarisation dependence of the emissions near the Fermi edge. For the cuprates only little is known about the impact of the electron-photon matrix element determining the photoelectron intensity. For the example of the model layered superconductor Bi₂Sr_(2-x)La_xCuO_(6+delta)it will be demonstrated that the polarization geometry has significant influence on the energy distribution curves at EF and consequently also for the determination of the topology and character of the Fermi surface (FS) by angle-resolved photoemission. For further clarification also a FS map of the n=2 material Bi-2212 has been measured applying a different polarisation geometry as previously used by Saini et al.. In the context of the current debate on the character of the Fermi surface of Bi-cuprates our results confirm a hole-like Fermi surface for n=1 as well as n=2 material, what might be the universal FS for high-Tc superconductors.

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