Local modification of spin orbit coupling in Sr2IrO4

Sr$_{2}$IrO$_{4}$ has a novel Mott insulating ground state that is a result of strong spin orbit coupling (SOC) splitting the t$_{\mathrm{2g}}$ states leaving a small bandwidth Jeff$=$1/2 valence band that can then be localized by the small 5d Coulomb repulsion. In order to investigate the effects that the strong SOC has on the novel ground state we have doped them with Rh$^{4+}$ atoms, which lower the SOC, which substitute for the the Ir$^{4+}$ ions. In bulk it has been shown that with only a small Rh concentration changes the insulating state to a metallic one and the low temperature magnetic state weakens. We have found several interesting results in these doped materials and will discuss them and what they tell us about the ground state of Sr$_{2}$IrO$_{4}$.