论文标题
在加压的准锰基化合物中，反铁磁向超导状态的翻转
Flipping of antiferromagnetic to superconducting states in pressurized quasi-one-dimensional manganese-based compounds
论文作者
论文摘要
非常规超导体的普遍特征之一是，超导（SC）状态是在抗铁磁（AFM）状态的接近度中发展出来的。了解这两种状态之间的相互作用是揭示非常规SC机制的潜在物理学的关键问题之一。在这里，我们报告了在准二维AMN6BI5（a = k，rb和cs）化合物中，AFM状态向SC状态的压力引起的倾斜。我们发现，在临界压力下，AFM状态突然在有限的温度下消失，而SC状态同时在较低的温度下出现，而没有可检测的结构变化。有趣的是，该家庭的所有成员都以几乎相同的临界压力（PC）呈现AFM-SC过渡，尽管它们的环境压力单位电池量差异很大。我们的理论计算表明，在压力下费米能量附近的DXZ轨道电子的重量增加可能是翻转的起源。这些结果揭示了3D转变金属化合物之间AFM和SC状态之间竞争性质的多样性。
One of the universal features of unconventional superconductors is that the superconducting (SC) state is developed in the proximity of an antiferromagnetic (AFM) state. Understanding the interplay between these two states is one of the key issues to uncover the underlying physics of unconventional SC mechanism. Here, we report a pressure-induced flipping of the AFM state to SC state in the quasi-one-dimensional AMn6Bi5 (A = K, Rb, and Cs) compounds. We find that at a critical pressure the AFM state suddenly disappears at a finite temperature and a SC state simultaneously emerges at a lower temperature without detectable structural changes. Intriguingly, all members of the family present the AFM-SC transition at almost the same critical pressures (Pc), though their ambient-pressure unit-cell volumes vary substantially. Our theoretical calculations indicate that the increasing weight of dxz orbital electrons near Fermi energy under the pressure may be the origin of the flipping. These results reveal a diversity of competing nature between the AFM and SC states among the 3d-transition-metal compounds.
