Experimental determination of superexchange energy from two-hole spectra

Giorgio Levy, Maayan Yaari, Tom Z. Regier +1

We follow the evolution of Copper and Oxygen two-hole excitations, in optimally doped (Ca${}_x$La${}_{1-x}$)(Ba${}_{1.75-x}$La${}_{0.25+x}$)Cu${}_3$O${}_y$ for $x=0.1$ and $x=0.4$. The…