Man Huiyuan, Iguchi Yusuke, Bao Jin-Ke, Chung Duck Young, Kanatzidis Mercouri G
Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, United States.
Stanford Nano Shared Facilities, Stanford University, Stanford, California 94305, United States.
Nano Lett. 2024 Jul 24;24(29):9082-9087. doi: 10.1021/acs.nanolett.4c02475. Epub 2024 Jul 15.
The coexistence of superconductivity and ferromagnetism is an intrinsically interesting research focus in condensed matter physics, but the study is limited by low superconducting () and magnetic () transition temperatures in related materials. Here, we used a scanning superconducting quantum interference device to image the in situ diamagnetic and ferromagnetic responses of RbEuFeAs with high and . We observed significant suppression of the superfluid density in the vicinity of the magnetic phase transition, signifying fluctuation-enhanced magnetic scatterings between Eu spins and Fe 3d conduction electrons. Intriguingly, we observed multiple ferromagnetic domains that should be absent in an ideal magnetic helical phase. The formation of these domains demonstrates a weak -axis ferromagnetic component probably arising from the Eu spin-canting effect, indicative of possible superconductivity-driven domain Meissner and domain vortex-antivortex phases, as revealed in EuFe(AsP). Our observations highlight that RbEuFeAs is a unique system that includes multiple interplay channels between superconductivity and ferromagnetism.
超导性与铁磁性的共存是凝聚态物理中一个本质上有趣的研究焦点，但该研究受到相关材料中超导（）转变温度和磁性（）转变温度较低的限制。在此，我们使用扫描超导量子干涉装置对具有高 和 的RbEuFeAs的原位抗磁性和铁磁性响应进行成像。我们观察到在磁相变附近超流密度有显著抑制，这表明Eu自旋与Fe 3d传导电子之间的涨落增强了磁散射。有趣的是，我们观察到多个铁磁畴，而在理想的磁螺旋相中这些铁磁畴是不存在的。这些畴的形成表明可能存在一个弱 轴铁磁分量，这可能源于Eu自旋倾斜效应，这暗示了可能存在超导驱动的畴迈斯纳相和畴涡旋 - 反涡旋相，正如在EuFe(AsP)中所揭示的那样。我们的观察结果突出表明，RbEuFeAs是一个独特的体系，其中包含超导性与铁磁性之间的多个相互作用通道。
