Photoemission Evidence for a Remnant Fermi Surface and a d- Wave-Like Dispersion in Insulating Ca 2 CuO 2 Cl 2
- 11 December 1998
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 282 (5396) , 2067-2072
- https://doi.org/10.1126/science.282.5396.2067
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 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.Keywords
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This publication has 46 references indexed in Scilit:
- Systematics of the Photoemission Spectral Function of Cuprates: Insulators and Hole- and Electron-Doped SuperconductorsPhysical Review Letters, 1998
- Unusual Superconducting State of Underdoped CupratesPhysical Review Letters, 1997
- A Unified Theory Based on SO (5) Symmetry of Superconductivity and AntiferromagnetismScience, 1997
- Doping-dependent quasiparticle band structure in cuprate superconductorsPhysical Review B, 1997
- Anomalous superconducting state gap size versus behavior in underdopedPhysical Review B, 1996
- Excitation Gap in the Normal State of Underdoped Bi 2 Sr 2 CaCu 2 O 8+ δScience, 1996
- High-pressure synthesis of superconducting (Ca, K)2 CuO2Cl2Physica C: Superconductivity and its Applications, 1995
- versus k Relations and Many Body Effects in the Model Insulating Copper Oxide CuPhysical Review Letters, 1995
- Comment on ‘‘Fermi surface and dynamics oft-Jmodel at moderate doping’’Physical Review Letters, 1994
- Low-temperature behavior of two-dimensional quantum antiferromagnetsPhysical Review Letters, 1988