We have measured and analyzed the in-plane thermal diffusivity of the Mott insulator Ca₂RuO₄ around room temperature under external currents with an infrared camera as a contactless thermometer. We find that the thermal diffusivity decreases by 40% for an external current density of 14 A/cm². This large impact on lattice properties highly nontrivial in the sense that the external current primarily affects the electronic states. A possible explanation for this is discussed.

中文翻译：

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非平衡稳态Mott绝缘子Ca2RuO4的热扩散率

我们已经使用红外照相机作为非接触式温度计在室温下在外部电流下测量和分析了Mott绝缘子Ca ₂ RuO ₄在室温下的面内热扩散率。我们发现，对于14 A / cm ²的外部电流密度，热扩散率降低40％。在外部电流主要影响电子状态的意义上，这种对晶格特性的巨大影响是非常重要的。讨论了对此可能的解释。