论文标题
Eurbfe $ _4 $ as $ _4 $中的拓扑磁顺序和超导性
Topological magnetic order and superconductivity in EuRbFe$_4$As$_4$
论文作者
论文摘要
我们研究了磁性超导体Eurbfe $ _4 $的单晶，AS $ _4 $，通过磁化，电子旋转共振（ESR），角度分辨光发射光谱（ARPES）和脉冲磁场中的电阻，高达630 KOE。低于36.5 K以下的超导状态几乎是各向同性的，只受到EU $^{2+} $磁性在15 K处的发展。欧盟$^{2+} $ - 飞机是对二维XY-MAGNET的良好实现，它反映了Eu $^{2+} $磁矩与超导群中的磁矩的脱钩。
We study single crystals of the magnetic superconductor EuRbFe$_4$As$_4$ by magnetization, electron spin resonance (ESR), angle-resolved photoemission spectroscopy (ARPES) and electrical resistance in pulsed magnetic fields up to 630 kOe. The superconducting state below 36.5 K is almost isotropic and only weakly affected by the development of Eu$^{2+}$ magnetic order at 15 K. On the other hand, for the external magnetic field applied along the c-axis the temperature dependence of the ESR linewidth reveals a Berezinskii-Kosterlitz-Thouless topological transition below 15 K. This indicates that Eu$^{2+}$-planes are a good realization of a two-dimensional XY-magnet, which reflects the decoupling of the Eu$^{2+}$ magnetic moments from superconducting FeAs-layers.
