Faculté des sciences

Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission

Schwaller, P. ; Greber, T. ; Aebi, Philipp ; Singer, J. M. ; Berger, H. ; Forró, L. ; Osterwalder, J.

In: The European Physical Journal B - Condensed Matter and Complex Systems, 2000, vol. 18, no. 2, p. 215-225

Full k ||-maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the antiferromagnetic insulator Sr2CuO2Cl2, which is taken as a representative of an undoped cuprate, and the Fermi surfaces of overdoped, optimally doped and... Plus

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    Summary
    Full k ||-maps of the electronic structure near the Fermi level of differently doped cuprates measured with angle-scanned photoelectron spectroscopy are presented. The valence band maximum of the antiferromagnetic insulator Sr2CuO2Cl2, which is taken as a representative of an undoped cuprate, and the Fermi surfaces of overdoped, optimally doped and underdoped Bi2Sr2CaCu2O8+' high-temperature superconductors are mapped in the normal state. The results confirm the existence of large Luttinger Fermi surfaces at high doping with a Fermi surface volume proportional to (1+x), where x is the hole concentration. At very low doping, however, we find that this assumption based on Luttinger's theorem is not fulfilled. This implies a change in the topology of the Fermi surface. Furthermore the intensity of the shadow bands observed on the Fermi surface of Bi2Sr2CaCu2O8+' as a function of the doping is discussed.