提取 Ca2RuO4 中非线性电流诱导现象的挑战
Challenges in extracting nonlinear current-induced phenomena in Ca2RuO4
AI总结：
本文利用电输运与磁化同时测量探测 Ca2RuO4 的非平衡稳态，通过 Joule 自热模型消除热效应，为研究高电阻材料的电流诱导现象提供基础。
摘要：
改变强关联材料性质的一个吸引人的方向是通过施加直流电来诱导非平衡稳态。虽然获得这些新态具有很高的科学意义，但电流引起的 Joule 加热通常构成了识别非热效应的障碍。最大的挑战通常在于准确测量施加直流电的样品温度，并使用能提供材料直接信息的探针。在这项工作中，我们利用电输运和磁化的同时测量来探测 Ca2RuO4 中的非平衡稳态。为了揭示非热电流诱导效应，我们采用了一个简单的 Joule 自热模型来消除加热效应，并讨论了样品内部温度不均匀性的重要性。我们的方法为研究高电阻材料中的电流诱导现象提供了坚实的基础。
英文摘要：
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.
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