Anomalous Expansion of the Copper-Apical Oxygen Distance in Superconducting La${}_2$CuO${}_4$ - La${}_{1.55}$Sr${}_{0.45}$CuO${}_4$ Bilayers

Hua Zhou, Yizhak Yacoby, Ron Pindak +3

We have introduced an improved X-ray phase-retrieval method with unprecedented speed of convergence and precision, and used it to determine with sub-Ångstrom resolution the complet…