论文标题
NDNIO $ _2 $的兴奋剂依赖性角色和可能的磁性顺序
Doping-dependent character and possible magnetic ordering of NdNiO$_2$
论文作者
论文摘要
无限层类型的新型镍超导体在正常状态相图中具有挑战性的电子特征，并具有掺杂。纠缠$ \ {$ ni- $ d_ {z^2} $，ni- $ d_ {x^2-y^2} $ d_ {x^2-y^2} $轨道部门的独特多体性行为和不同的分散体制会引起高度丰富的物理，这在这里研究了Ndnio $ _2 $ _2 $系统。基于先进的现实动态平均场理论揭示了超导孔掺杂区域的一项分析是（自我）掺杂的Mott绝缘子从不足的一侧的遇见地，而来自超侧的不良Hund Metal。 ni- $ d_ {z^2} $ flat-band绑扎的fermi级交叉在一起，两者都会形成一个非常规超导性的奇异竞技场。我们进一步阐明了无限层镍含量难以捉摸的磁性问题。在低温下，具有小Ni矩的抗铁磁（AFM）秩序被证明是至关重要的竞争者。在化学计量时，沿$ c $轴沿着$ c $轴的铁磁旋转对齐的C-AFM订单受益于与Kondo（-lattice）筛选的可疑共存。
The novel nickelate superconductors of infinite-layer type feature challenging electronic pecularities in the normal-state phase diagram with doping. Distinct many-body behavior and different dispersion regimes of the entangled $\{$Ni-$d_{z^2}$, Ni-$d_{x^2-y^2}$$\}$ orbital sector give rise to highly rich physics, which is here studied for the case of the NdNiO$_2$ system. An analysis based on advanced realistic dynamical mean-field theory unveils that the superconducting hole-doped region is the meeting place of a (self-)doped Mott insulator from the underdoped side, and a bad Hund metal from the overdoped side. Fermi-level crossing of the Ni-$d_{z^2}$ flat-band ties both regimes together to form a singular arena for unconventional superconductivity. We furthermore shed light on the intriguing problem of elusive magnetism in infinite-layer nickelates. Antiferromagnetic (AFM) order with small Ni moments is shown to be a vital competitor at low temperature. At stoichiometry, C-AFM order with ferromagnetic spin-alignment along the $c$-axis benefits from a conceivable coexistence with Kondo(-lattice) screening.
