论文标题
NBSE $ _2 $中的超导性和磁性
Ising superconductivity and magnetism in NbSe$_2$
论文作者
论文摘要
最近关于NBSE $ _2 $超导性的研究表明，当材料还原为单个单层时，超导临界场中的各向异性很大。在最近的发现中，我们使用密度功能理论（DFT）计算来定量解决散装和单层NBSE $ _2 $的超导性能。我们证明，NBSE $ _2 $接近铁磁不稳定性，并在NBSE $ _2 $中旋转易感性的实验测量背景下分析我们的结果。我们展示了这种磁性不稳定是如何在单个单层中发音的，它可以使超导订单参数的大量单曲 - 三曲线混合在一起，与当代对单层NBSE NBSE $ _2 $中的配对对称性的考虑相反，并讨论了如何在我们的混音中进行量身定量的方法来讨论如何在我们的dfft Framework中进行定量的定量。我们的计算还可以使用单层NBSE NBSE $ _2 $在正常状态下的DFT计算，对超导关键领域的大型各向异性进行定量描述
Recent studies on superconductivity in NbSe$_2$ have demonstrated a large anisotropy in the superconducting critical field when the material is reduced to a single monolayer. Motivated by this recent discovery, we use density functional theory (DFT) calculations to quantitatively address the superconducting properties of bulk and monolayer NbSe$_2$. We demonstrate that NbSe$_2$ is close to a ferromagnetic instability, and analyze our results in the context of experimental measurements of the spin susceptibility in NbSe$_2$. We show how this magnetic instability, which is pronounced in a single monolayer, can enable sizeable singlet-triplet mixing of the superconducting order parameter, contrary to contemporary considerations of the pairing symmetry in monolayer NbSe$_2$, and discuss approaches as to how this degree of mixing can be addressed quantitatively within our DFT framework. Our calculations also enable a quantitative description of the large anisotropy of the superconducting critical field, using DFT calculations of monolayer NbSe$_2$ in the normal state
