Effects of charge doping a Mott insulator with strong spin-orbit coupling*

The study of emergent novel quantum phases that result from the competing interactions of strong electron correlations and spin-orbit coupling (SOC) is of great current relevance. Double perovskites with 5d transition metal ions display comparable magnitudes of electron correlations, crystal field, and SOC, making them perfect candidate materials to study the consequences of such interactions. We used this class of materials to probe the effect of charge doping on a Mott insulator with strong spin-orbit entanglement. Specifically, in this talk, we present a comprehensive study of the electron-doped powder, double perovskite Ba₂Na_1-xCa_xOsO₆ through the Na/Ca partial substitution using nuclear magnetic resonance (NMR), muon spin relaxation (uSR), and superconducting quantum interference device (SQUID) measurements for 0 < x < 1.