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Doping-dependent electronic structure of cuprates studied using angle-scanned photoemission
Auteur(s)
Schwaller, P.
Greber, T.
Aebi, Philipp
Singer, J. M.
Berger, H.
Forró, L.
Osterwalder, J.
Date de parution
2000
In
The European Physical Journal B - Condensed Matter and Complex Systems, Springer, 2000/18/2/215-225
Résumé
Full k <sub>
</sub>-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 Sr<sub>2</sub>CuO<sub>2</sub>Cl<sub>2</sub>, which is taken as a representative of an undoped cuprate, and the Fermi surfaces of overdoped, optimally doped and underdoped Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+</sub>' 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 Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+</sub>' as a function of the doping is discussed.
Identifiants
Type de publication
journal article
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