Eversus k Relations and Many Body Effects in the Model Insulating Copper OxideSr2CuO2Cl2

著者: B. O. Wells, Zexiang Shen, A. Y. Matsuura, David M. King, M. A. Kastner, M. Greven, R. J. Birgeneau - Physical Review Letters 1995 被引用: 492

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.