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

Research output: Contribution to journalArticlepeer-review

Abstract

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 a approximately the /cosk(x)a - cosk(y)a/ form along this remnant Fermi surface. Together with the data from Dy-doped Bi2Sr2CaCu2O8+8, these results suggest that this d-wave-like dispersion of the insulator is the underlying reason for the pseudo gap in the underdoped regime.

Original languageEnglish (US)
Pages (from-to)2067-2072
Number of pages6
JournalScience
Volume282
Issue number5396
DOIs
StatePublished - Dec 11 1998
Externally publishedYes

ASJC Scopus subject areas

  • General

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