Ca $_{2}$ RuO $_{4}$中电流诱导相共存的证据及其对磁序的影响
Evidence for current-induced phase coexistence in Ca$_{2}$RuO$_{4}$ and its influence on magnetic order
摘要：
将准静态和时间分辨输运测量与X射线和中子衍射实验相结合，我们研究了在电流密度下纯Ca和Ti取代的Ca $_2$ RuO $_4$中出现的非平衡态。时间分辨的电流感应开关的研究发现一个缓慢的电导松弛，可以确定与加热和一个快速的，明确地证明了一个内在的机制。电流诱导的相变导致复杂的衍射图案。分离的布拉格反射，可以与金属和绝缘相通过它们的晶格参数，指示一个真实的结构与相共存，强烈地随温度和电流强度变化。第三个贡献与$c$晶格常数之间的金属和绝缘相出现在冷却。在低电流密度下，这个额外的阶段出现低于$\sim$ 100 K，并伴随着抑制的反铁磁秩序，否则可以与载流状态共存。一个可能的起源的中间阶段进行了讨论。
英文摘要：
Combining quasistatic and time-resolved transport measurements with X-ray and neutron diffraction experiments we study the non-equilibrium states that arise in pure and in Ti substituted Ca$_2$RuO$_4$ under the application of current densities. Time-resolved studies of the current-induced switching find a slow conductance relaxation that can be identified with heating and a fast one that unambiguously proves an intrinsic mechanism. The current-induced phase transition leads to complex diffraction patterns. Separated Bragg reflections that can be associated with the metallic and insulating phases by their lattice parameters, indicate a real structure with phase coexistence that strongly varies with temperature and current strength. A third contribution with a $c$ lattice constant in between those of metallic and insulating phases appears upon cooling. At low current densities, this additional phase appears below $\sim$100 K and is accompanied by a suppression of the antiferromagnetic order that otherwise can coexist with current carrying states. A possible origin of the intermediate phase is discussed.
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