Fig. 3: AFM domain selection in the superconducting and normal states.

Magnetic Bragg peak intensity as a function of field along the \([1\overline{1}0]\) direction at different temperatures for Nd_0.1Ce_0.9CoIn₅ (a, b), in the normal conducting state of Nd_0.17Ce_0.83CoIn₅ (c) and for the correlated metal Nd_0.25Ce_0.75CoIn₅ (d). BG indicates the background, measured in the paramagnetic states of Nd_xCe_1−xCoIn₅. The rectangular prisms displayed in (a) are a schematic view of the sample showing the evolution of the domain population. At low fields (regime I), both k⁺ and k⁻ domains are present with equal population. In regime II, a domain repopulation takes place, favoring the domain which is mostly perpendicular to the field direction, i.e., k⁺. In regime III, a single k⁺ domain state is obtained. The vertical green line in (a) indicates the field where we have performed complementary electrical resistivity measurements (see Figs. 4 and 5).