AI 中文总结
研究双层镍酸盐La$_3$Ni$_2$O$_7$正常态关联物理，基于邻近轨道选择性莫特相的不良金属态实验证据，用有效局域矩经历特定相互作用的新方式描述磁关联，得出接近特定波矢的磁序，与实验相符并讨论对非常规超导性的影响。
AI 中文摘要
双层镍酸盐La$_3$Ni$_2$O$_7$中高温超导性的发现引发了对其正常态关联物理的广泛兴趣。鉴于超导性在相图中密度波序附近出现，阐明该序的性质很重要。基于邻近轨道选择性莫特相的不良金属态的实验证据，我们用新方式描述系统磁关联，即有效局域矩经历RKKY和超交换相互作用，得出接近$\mathbf{Q}=(\pi/2,\pi/2)$波矢的磁序并理解相关自旋动力学，结果与双层镍酸盐密度波序磁关联实验相符，还讨论了对非常规超导性的影响。
英文摘要
The recent discovery of high-temperature superconductivity in the bilayer nickelate La$_3$Ni$_2$O$_7$ has led to extensive interest in the correlation physics of its normal state. Given that the superconducitivity develops near a density wave order in the phase diagram, it is important to elucidate the nature of this order. Based on the accumulated experimental evidence for a bad metal state in proximity to an orbital-selective Mott phase, here we describe magnetic correlations of the system in a conceptually new way -- in terms of effective local moments experiencing a combination of RKKY and superexchange interactions. This gives rise to a magnetic order with a wavevector that is close to $\mathbf{Q}=(π/2,π/2)$ and, at the same time, yields a clear understanding of the associated spin dynamics. Our results are consistent with the rapidly emerging experiments about the magnetic correlations in the density wave order of the bilayer nickelate. Implications for unconventional superconductivity in this and related multiorbital systems are discussed.
Comments7+3 pages, 5+1 figures
