KTaO$_3$异质界面处铁磁性与超导性的共存
Coexistence of ferromagnetism and superconductivity at KTaO$_3$ heterointerfaces
AI总结：
该研究在KTaO$_3$异质界面超导体中观测到室温以上仍存在的二维长程铁磁序，并结合计算与XMCD揭示其源于氧空位诱导的Ta 5$d$局域电子。
摘要：
超导性与铁磁性的共存因其两种有序态的对立本质，长期以来是超导领域的一个难题。在实验上识别并表征与磁性共存的新型异质界面超导体面临重大挑战。本文报道了在KTaO$_3$异质界面超导体中实验观测到的二维长程铁磁有序，表明超导性与铁磁性共存。值得注意的是，我们的直流超导量子干涉器件测量揭示了一种在室温以上仍持续存在的面内磁化磁滞回线。此外，第一性原理计算和X射线磁圆二色测量为所观测到的稳健铁磁性的起源提供了决定性认识，将其归因于氧空位，这些氧空位使电子局域在附近的Ta 5$d$态中。我们的发现不仅表明KTaO$_3$异质界面是时间反演对称性破缺的超导体，还为探索超导性与磁性之间复杂的相互作用注入了新的动力；这种相互作用因KTaO$_3$异质界面5$d$轨道中重元素Ta固有的强自旋轨道耦合而增强。
英文摘要：
The coexistence of superconductivity and ferromagnetism is a long-standing issue in superconductivity due to the antagonistic nature of these two ordered states. Experimentally identifying and characterizing novel heterointerface superconductors that coexist with magnetism presents significant challenges. Here, we report the experimental observation of two-dimensional long-range ferromagnetic order in the KTaO$_3$ heterointerface superconductor, showing the coexistence of superconductivity and ferromagnetism. Remarkably, our direct current superconducting quantum interference device measurements reveal an in-plane magnetization hysteresis loop persisting above room temperature. Moreover, the first-principles calculations and X-ray magnetic circular dichroism measurements provide decisive insights into the origin of the observed robust ferromagnetism, attributing it to oxygen vacancies that localize electrons in nearby Ta 5$d$ states. Our findings not only suggest KTaO$_3$ heterointerfaces as time-reversal symmetry breaking superconductors, but also inject fresh momentum into the exploration of the intricate interplay between superconductivity and magnetism, enhanced by the strong spin-orbit coupling inherent to the heavy Ta in 5$d$ orbitals of KTaO$_3$ heterointerfaces.
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