Suppressed magnetism in Ca$_2$RuO$_4$ under applied electric currents

The $4d$-electron system Ca$_2$RuO$_4$ plays host to an exciting interplay between spin-orbit coupling and electronic correlation energies that gives rise to exotic ground states and a high sensitivity to external perturbation. Isovalent Sr-doping, hydrostatic pressure and even applied electric currents can induce dramatic changes in the exhibited electronic and magnetic properties. Here, we use single crystal neutron diffraction with in-situ applied electric currents to show that a previously identified current induced metal-insulator transition is linked to a modified distortion of the RuO$_6$ octahedra and a concomitant suppression of antiferromagnetic order. These results indicate a close correlation among the crystal lattice, electronic, and magnetic structures.