Abstract
The Cu-3d states in the high-Tc cuprates are often described as a single band of 3dx2−y2 states, with the other four 3d states having about 2 to 3 eV higher energy due to the lower-than-octahedral crystal field at the copper sites. However, excitations to these higher energy states observed with RIXS show indications of strong coupling to doped holes in the 3dx2−y2 band. This relaunches a decades-old question of the possible role of the orbital degrees of freedom that once motivated Bednorz and Müller to search for superconductivity in these systems. Here we explore a direction different from the Jahn–Teller electron–phonon coupling considered by Bednorz and Müller, namely the interaction between holes mediated by dd excitations.
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