论文标题
CA $ _ {2} $ ruo $ _ {4} $的当前引起的相位共存的证据及其对磁性顺序的影响
Evidence for current-induced phase coexistence in Ca$_{2}$RuO$_{4}$ and its influence on magnetic order
论文作者
论文摘要
与X射线和中子衍射实验相结合的准和时间分辨的传输测量结果，我们研究了在纯净的CA $ _2 $ _4 $ _4 $中在当前密度应用下出现的非平衡状态。对电流引起的开关的时间分辨研究发现了缓慢的电导弛豫，可以通过加热来识别，并且可以明确证明一种固有机制的速度。电流诱导的相变导致复杂的衍射模式。分离的Bragg反射可以通过其晶格参数与金属和绝缘阶段相关联，这表明具有相共存的真实结构，与温度和电流强度有很大变化。在冷却时，在金属和绝缘阶段之间的$ C $晶格常数的第三个贡献。在低电流密度下，此额外阶段的出现在$ \ sim $ 100 K以下，并伴随着抑制抗磁性顺序，否则该抗通过当前的携带状态可以共存。讨论了中间阶段的可能起源。
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.
