<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi></mml:math>versus k Relations and Many Body Effects in the Model Insulating Copper Oxide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Cu<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
B. O. Wells(Massachusetts Institute of Technology), Zexiang Shen(Stanford University), A. Y. Matsuura(Stanford University), David M. King(Stanford University), M. A. Kastner(Massachusetts Institute of Technology), M. Greven(Massachusetts Institute of Technology), R. J. Birgeneau(Massachusetts Institute of Technology)
Cited by 492
Abstract
We report angle resolved photoemission measurements on ${\mathrm{Sr}}_{2}$Cu${\mathrm{O}}_{2}$${\mathrm{Cl}}_{2}$, an insulating layered copper oxide. We find that the overall width of the highest occupied band and the position of the band maximum at ($\frac{\ensuremath{\pi}}{2}, \frac{\ensuremath{\pi}}{2}$) agree with predictions of the $t\ensuremath{-}J$ model and other calculations based on the Hubbard model. However, in many regions of the Brillouin zone, the shape of the band differs from these predictions. A comparison of our data with spectra previously reported on metallic samples leads to new suggestions for the phenomenology of doping.