Photoemission Evidence for a Remnant Fermi Surface and d-Wave-Like Dispersion in Insulating Ca2CuO2Cl2

Abstract

An angle resolved photoemission study on Ca2CuO2Cl2, a parent compound of high Tc superconductors is reported. Analysis of the electron occupation probability, n(k) from the spectra shows a steep drop in spectral intensity across a contour that is close to the Fermi surface predicted by the band calculation. This analysis reveals a Fermi surface remnant even though Ca2CuO2Cl2 is a Mott insulator. The lowest energy peak exhibits a dispersion with approximately the |cos(kxa)-cos(kya)| form along this remnant Fermi surface. Together with the data from Dy doped Bi2Sr2CaCu2O(8 + delta) these results suggest that this d-wave like dispersion of the insulator is the underlying reason for the pseudo gap in the underdoped regime.

9 pages, including 7 figures. Published in Science, one figure corrected

References in corpus (15)

• Correlated Electrons in High Temperature Superconductors
• The Unusual Superconducting State of Underdoped Cuprates
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• Theory of electron-hole asymmetry in doped {\em CuO${}_2$} planes
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• Doping dependent quasiparticle band structure in cuprate superconductors
• Violation of Luttinger's Theorem in the Two-Dimensional t-J Model
• Spin Gaps in High Temperature Superconductors

Cited by in corpus (137)

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