论文标题
在磁过渡金属二分法中，在超导性边界上强烈相关的巡回磁性
Strongly correlated itinerant magnetism on the boundary of superconductivity in a magnetic transition metal dichalcogenide
论文作者
论文摘要
具有强烈相互作用电子的金属铁磁体通常表现出显着的电子相，例如铁磁超导性，复杂的自旋纹理和非平凡的拓扑。在本报告中，我们讨论了分层磁性金属nita $ _4 $ se $ _8 $（或ni $ _ {1/4} $ tase $ _ {2} $）的合成，居里温度为58 kelvin。磁化数据和\ textit {ab intib}计算表明，镍原子的单轴铁磁顺序约为0.7 $μ__{b} $每个原子，而在静脉刺激性传导电子中产生了更小的时刻。在费米水平附近的平坦波段，高热量系数和高的Kadowaki-woods比率中，很明显的相关性很明显。当系统被磁离子稀释时，样品将变为超过2 kelvin的超导。值得注意的是，电子和孔费米表面与相反的自旋极化有关。我们讨论了这一特征对在该材料中流行的铁磁性附近出现的超导性的含义，包括旋转偏置超导性的可能性。
Metallic ferromagnets with strongly interacting electrons often exhibit remarkable electronic phases such as ferromagnetic superconductivity, complex spin textures, and nontrivial topology. In this report, we discuss the synthesis of a layered magnetic metal NiTa$_4$Se$_8$ (or Ni$_{1/4}$TaSe$_{2}$) with a Curie temperature of 58 Kelvin. Magnetization data and \textit{ab initio} calculations indicate that the nickel atoms host uniaxial ferromagnetic order of about 0.7$μ_{B}$ per atom, while an even smaller moment is generated in the itinerant tantalum conduction electrons. Strong correlations are evident in flat bands near the Fermi level, a high heat capacity coefficient, and a high Kadowaki-Woods ratio. When the system is diluted of magnetic ions, the samples become superconducting below about 2 Kelvin. Remarkably, electron and hole Fermi surfaces are associated with opposite spin polarization. We discuss the implications of this feature on the superconductivity that emerges near itinerant ferromagnetism in this material, including the possibility of spin-polarized superconductivity.
