Challenges in extracting nonlinear current-induced phenomena in Ca2RuO4

Abstract

An appealing direction to change the properties of strongly correlated materials is to induce nonequilibrium steady states by the application of a direct current. While access to these novel states is of high scientific interest, Joule heating due to current flow often constitutes a hurdle to identify nonthermal effects. The biggest challenge usually resides in measuring accurately the temperature of a sample subjected to direct current, and to use probes that give direct information of the material. In this work, we exploit the simultaneous measurement of electrical transport and magnetisation to probe non-equilibrium steady states in Ca2RuO4. In order to reveal non-thermal current-induced effects, we employ a simple model of Joule self-heating to remove the effects of heating and discuss the importance of temperature inhomogeneity within the sample. Our approach provides a solid basis for investigating current-induced phenomena in highly resistive materials.

References in corpus (5)

• Emergence of a metallic meta-stable phase induced by electrical current in Ca_2RuO_4
• Evidence for current-induced phase coexistence in Ca${}_2$RuO${}_4$ and its influence on magnetic order
• Current driven insulator-to-metal transition without Mott breakdown in Ca${}_2$RuO${}_4$
• Pattern Formation by Electric-field Quench in Mott Crystal
• Diamagnetic-like response from localised heating of a paramagnetic material