A muSR study of current-induced destruction of order in Ca₂RuO₄

Past work has shown that Ca₂RuO₄ is a Mott insulator, but can be switched to a semimetallic state with the application of a reasonable amount of current. The material is an antiferromagnet below 113K in the insulating state, but achieving the semimetallic state causes a destruction of order, instead giving a diamagnetic response [1]. For this muSR study on the material, we used a 1% Ti doped Ca₂RuO₄ sample, which provided improved structural stability without significantly impacting magnetic ordering temperature [1]. We measured the sample under 0mA, 30mA, and 100mA of current, demonstrating both the presence of an antiferromagnetic ordering and its destruction in the semimetallic state when a current is applied down to 15K.

[1] Sow, C. et al. Current-induced strong diamagnetism in the Mott insulator Ca2RuO4. Science (80-. ). 1087, 1084–1087 (2017).
[2] Fobes, D. et al. Metal-insulator transition in doped Ca₂RuO₄ : Potential application in bolometric detection. J. Appl. Phys. 111, 083709 (2012).