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

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Science  11 Dec 1998:
Vol. 282, Issue 5396, pp. 2067-2072
DOI: 10.1126/science.282.5396.2067

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An angle-resolved photoemission study is reported on Ca2CuO2Cl2, a parent compound of high-T c superconductors. 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 |coskxa – coskya| form along this remnant Fermi surface. Together with the data from Dy-doped Bi2Sr2CaCu2O8+δ, these results suggest that this d-wave–like dispersion of the insulator is the underlying reason for the pseudo gap in the underdoped regime.

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