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Science 11 December 1998:
Vol. 282. no. 5396, pp. 2067 - 2072
DOI: 10.1126/science.282.5396.2067
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Reports

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

F. Ronning, C. Kim, D. L. Feng, D. S. Marshall, A. G. Loeser, L. L. Miller, J. N. Eckstein, I. Bozovic, Z.-X. Shen *

An angle-resolved photoemission study is reported on Ca2CuO2Cl2, a parent compound of high-Tc 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+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.

F. Ronning, C. Kim, D. L. Feng, A. G. Loeser, and Z.-X. Shen are with the Departments of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford, CA 94305, USA. D. S. Marshall is with the Departments of Physics, Applied Physics, and Stanford Synchrotron Radiation Laboratory, Stanford, CA 94305, USA, and Motorola, Phoenix Corporate Research Lab, Tempe, AZ 85284, USA. L. L. Miller is with the Department of Physics, Iowa State University, Ames, IA 50011, USA. J. N. Eckstein and I. Bozovic are at the Ginzton Research Center, Varian Associates, Palo Alto, CA 94304, USA.
*   To whom correspondence should be addressed. E-mail: shen{at}ee.stanford.edu

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