论文标题
无限层镍作为Ni-eg Hund的金属
Infinite-layer nickelates as Ni-eg Hund's metals
论文作者
论文摘要
最近且令人兴奋的发现，在孔掺杂的无限层镍盐ND 1-δSRδNiO2中，超导性引起了人们对相关量子材料的强烈关注。从理论上的角度来看，这类新的非常规的超导材料提供了一个机会，可以在相关的量子材料中推出新物理。在这里，我们研究了局部光谱的温度和掺杂依赖性以及第一原理的电荷，自旋和轨道敏感性。通过使用AB ISIO LQSGW+DMFT方法，我们表明现场Hund在Ni-D轨道中的耦合会导致NI-EG轨道中Hund金属相的多个特征。提议的镍作为EG（两个轨道）金属的图片与基于Fe的超导体的图片不同，作为五轨道的金属，以及Cuprates作为掺杂的电荷传输绝缘子的图片。我们的发现揭示了一类新的Hunds金属，并且对相关的两个轨道系统具有潜在的影响，远离半填充。
The recent and exciting discovery of superconductivity in the hole-doped infinite-layer nickelate Nd 1-δ Sr δ NiO 2 draws strong attention to correlated quantum materials. From a theoretical view point, this new class of unconventional superconducting materials provides an opportunity to unveil new physics in correlated quantum materials. Here we study the temperature and doping dependence of the local spectrum as well as the charge, spin and orbital susceptibilities from first principles. By using ab initio LQSGW+DMFT methodology, we show that onsite Hund's coupling in Ni-d orbitals gives rise to multiple signatures of Hund's metallic phase in Ni-eg orbitals. The proposed picture of the nickelates as an eg (two orbital) Hund's metal differs from the picture of the Fe-based superconductors as a five orbital Hund's metal as well as the picture of the cuprates as doped charge transfer insulators. Our finding unveils a new class of the Hunds metals and has potential implications for the broad range of correlated two orbital systems away from half-filling.
