Abstract
In high-temperature superconductors two-dimensional CuO 2-planes are separated by metal-oxide layers. These supply charge and separate the layers. How they influence the electronic structure and whether they couple the CuO 2 layers is unclear. Using resonant photoemission we demonstrate a new technique to study such coupling. This is done by measuring the resonance of Cu-states across the rare-earth 4d level. Using Bi 2Sr 2(Ca, Nd)Cu 2O 8 as an example we show that there is a significant coupling between electronic states on Nd and Cu.
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