Figure 2

Figure 2: (Left) Phase diagram of fluorine doped CeO1-xFxFeAs as determined by neutron scattering (from [16]), showing a smooth (second-order) change from antiferromagnetism (AFM) at low doping to superconductivity (SC) at larger dopings. TN is the magnetic transition, with the inset the value of the staggered magnetic moment. (Right) Phase diagram of fluorine doped LaO1-xFxFeAs (from [17]), showing a more abrupt (first-order) change from spin-density-wave (SDW) antiferromagnetism to superconductivity as a function of fluorine content. Ts is the structural transition.