论文标题
由强载载载铁的oxypnictide lafeaso $ _ {0.49} $ h $ _ {0.51} $驱动的磁性。
Magnetism driven by strong electronic correlation in the heavily carrier-doped iron oxypnictide LaFeAsO$_{0.49}$H$_{0.51}$
论文作者
论文摘要
在基于铁的Lafeaso $ _ {1-X} $ h $ _ {x} $ $ x \ gtrsim0.4 $的超级导体中产生的第二抗磁相（AF2）的磁性，由Muon旋转旋转测量值调查，高达2.6 gpa。 $ x = 0.51 $获得的样品获得的Néel温度（$ t _ {\ rm n} $）对压力的敏感性要比原始的抗fiferromagnetic阶段（AF1，$ x \ lyssimsim0.06 $）高得多。此外，尽管AF1阶段总是伴随着在温度（$ t _ {\ rm s} $）下从四方过渡到正骨的过渡（\ rm s} $），该过渡略高于$ t _ {\ rm n} $，但AF2阶段在较高的压力上以$ \ sim $ \ sim $ 1.5 gpa的速度prepand（ S} = 0 $）。这些特征表明，AF2相的显微镜起源与AF1的显微镜不同，这表明电子相关在前一阶段起重要作用。我们认为，轨道选择性Mott Transition是一个合理的方案，可以说明$ t _ {\ rm n} $和$ t _ {\ rm s} $的观察到压力依赖性。
The magnetism of the second antiferromagnetic phase (AF2) arising in the iron-based LaFeAsO$_{1-x}$H$_{x}$ superconductor for $x\gtrsim0.4$ was investigated by muon spin rotation measurements under hydrostatic pressure up to 2.6 GPa. The Néel temperature ($T_{\rm N}$) obtained for a sample with $x=0.51$ exhibits considerably greater sensitivity to pressure than that in the pristine antiferromagnetic phase (AF1, $x\lesssim0.06$). Moreover, while the AF1 phase is always accompanied by the structural transition (from tetragonal to orthorhombic) at a temperature ($T_{\rm s}$) which is slightly higher than $T_{\rm N}$, the AF2 phase prevails at higher pressures above $\sim$1.5 GPa where the structural transition is suppressed ($T_{\rm s}=0$). These features indicate that the microscopic origin of the AF2 phase is distinct from that of AF1, suggesting that electronic correlation plays important role in the former phase. We argue that the orbital-selective Mott transition is a plausible scenario to account for the observed pressure dependence of $T_{\rm N}$ and $T_{\rm s}$ in the AF2 phase.
