论文标题
孔掺杂的无限镍镍超导体中的磁性不一致
Incommensurate Magnetic Order in Hole-Doped Infinite-layer Nickelate Superconductors
论文作者
论文摘要
磁性和超导性紧密纠缠，阐明镍超导体中的磁相互作用是理解配对机制的核心。我们的第一原理和自旋波理论的计算强调，ndnio $ _2 $是在准二维（2D）反铁磁性（AFM）状态与三维（3D）C-AFM状态之间过渡的附近。两种状态都可以准确地重现实验测量的磁激励光谱，这是先前用2D模型来解释的。我们进一步揭示了孔掺杂可以稳定不相称的（IC）自旋状态，而IC波矢量不断增加。建立了孔掺杂，磁化，交换常数和磁顺序之间的直接连接，表明第一邻居和第三邻平面内磁相互作用之间的竞争是IC磁性顺序的关键。
Magnetism and superconductivity are closely entangled, elucidating the magnetic interactions in nickelate superconductors is at the heart of understanding the pairing mechanism. Our first-principles and spin-wave theory calculations highlight that NdNiO$_2$ is in the vicinity of a transition between a quasi-two-dimensional (2D) antiferromagnetic (AFM) state and a three-dimensional (3D) C-AFM state. Both states could accurately reproduce the experimentally measured magnetic excitation spectra, which was previously explained in terms of a 2D model. We further reveal that hole doping stabilizes an incommensurate (IC) spin state and the IC wave vector increases continuously. Direct links between hole doping, magnetization, exchange constants, and magnetic order are established, revealing that the competition between first-neighbor and third-neighbor in-plane magnetic interactions is the key for the IC magnetic order.
