论文标题
ba $ _ {1-x} $ rb $ _ {x} $ fe $ _ {2} $ as $ _ {2} $单晶的充电运输运输
Charge Transport in Ba$_{1-x}$Rb$_{x}$Fe$_{2}$As$_{2}$ Single Crystals
论文作者
论文摘要
最近对基于孔的孔基于铁的超导体RBFE $ _2 $作为$ _2 $的研究表明，沿Fe-As方向沿Fe-As Direction的新型电子nematicity的出现，45 $^\ circ $从通常在Bafe $ _2 $ as $ _2 $和相关材料中旋转的通常在Bafe $ _2 $和相关材料中旋转。这激发了我们研究ba $ _ {1-x} $ rb $ _ {x} $ fe $ _ {2} $作为$ _ {2} $的物理属性，其详细信息在很大程度上没有探索。在这里，我们报告了Ba $ _ {1-x} $ rb $ _ {x} $ fe $ _ {2} $作为$ _ {2} $ superconductors中的普通状态充电传输，该$ _ {2} $通过在RB浓度范围内使用高质量的单晶$ 0.14 \ le x \ le x \ le 1.00 $。从对电阻率的温度依赖性$ρ（t）$的系统测量中，我们找到了与最佳组成周围费米液体行为偏差的签名，这似乎与抗毒素量子量关键无关，但可能与隐藏的nematic量子差异有潜在的联系。此外，从$ t^2 $的系数中得出的电子相关性显示，电阻率显着增加，而RB含量附近孔掺杂的端端附近，与基于铁的超导管器中的$ 3D^5 $电子构型附近的假定Mott物理相一致。
Recent studies in heavily hole-doped iron-based superconductor RbFe$_2$As$_2$ have suggested the emergence of novel electronic nematicity directed along the Fe-As direction, 45$^\circ$ rotated from the usual nematicity ubiquitously found in BaFe$_2$As$_2$ and related materials. This motivates us to study the physical properties of Ba$_{1-x}$Rb$_{x}$Fe$_{2}$As$_{2}$, details of which remain largely unexplored. Here we report on the normal-state charge transport in Ba$_{1-x}$Rb$_{x}$Fe$_{2}$As$_{2}$ superconductors by using high-quality single crystals in the range of Rb concentration $0.14\le x \le 1.00$. From the systematic measurements of the temperature dependence of electrical resistivity $ρ(T)$, we find a signature of a deviation from the Fermi liquid behavior around the optimal composition, which does not seem related to the antiferromagnetic quantum criticality but has a potential link to hidden nematic quantum criticality. In addition, electron correlations derived from the coefficient of $T^2$ resistivity show a marked increase with Rb content near the heavily hole-doped end, consistent with the putative Mott physics near the $3d^5$ electron configuration in iron-based superconductors.
