用AC和DC磁性测量及低Ti掺杂研究$CaRuO_3$的反常磁性
The anomalous magnetic properties of $CaRuO_3$ probed by AC and DC magnetic measurements and by low Ti impurity doping
摘要：
钙铁酸盐（$CaRuO_3$）被广泛认为是位于接近量子临界点，由于强烈的非费米液体的行为表示的电子输运，比热，光学电导率等的温度依赖性，然而，相应的异常行为，标记交叉温度制度的磁响应的$CaRuO_3$，仍然缺乏。在这里，我们报告详细的交流和直流磁化率测量$CaRuO_3$和$CaRu_{0.97}Ti_{0.03}O_3$。$CaRuO_3$的交流磁化率测量表明，在~ 40 K以下，对交流磁场的频率有轻微的依赖性，并且在12 K附近，曲率有额外的微妙变化。我们将这些结果解释为自旋涨落向T=0 K的临界减慢。我们证实了这些意见的磁测量$CaRu_{0.97}Ti_{0.03}O_3$，这表明一个明显的磁响应对应于上述温度。
英文摘要：
Calcium ruthenate ($CaRuO_3$) is widely believed to be located close to a quantum critical point due to the strong non-Fermi-liquid behavior expressed in the temperature dependence of electronic transport, specific heat, optical conductivity, etc. However, the corresponding anomalous behavior, marking crossover temperature regimes in the magnetic response of $CaRuO_3$, is still lacking. Here we report detailed AC and DC magnetic susceptibility measurements of $CaRuO_3$ and $CaRu_{0.97}Ti_{0.03}O_3$. The AC magnetic susceptibility measurements of the $CaRuO_3$ show a slight dependence on the frequency of AC magnetic field below ~ 40 K, and an additional subtle change of curvature around 12 K. We interpret these results as a critical slowing down of spin fluctuations towards T=0 K. We confirm these observations by magnetic measurements of $CaRu_{0.97}Ti_{0.03}O_3$, which show a pronounced magnetic response corresponding to the above temperatures.
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