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

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arxiv cond-mat/9903151 v1 pith:6VWTJ44G submitted 1999-03-09 cond-mat.supr-con

F. Ronning , C. Kim , D.L. Feng , D.S. Marshall , A.G. Loeser , L.L. Miller , J.N. Eckstein , I. Bozovic
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Z.-X. Shen
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classification cond-mat.supr-con
keywords fermisurfaceca2cuo2cl2dispersionremnantanalysisinsulatorphotoemission
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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.

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