论文标题
在库酸酯超导体YBCO中，伪随阶段的开始温度没有nematicity
No nematicity at the onset temperature of the pseudogap phase in the cuprate superconductor YBCO
论文作者
论文摘要
电子非神经性是金属中旋转对称性的自发损失，而不会破坏翻译对称性。在乡土的超导体中，有实验性的nematicity证据，但其起源尚不清楚。在这里，我们调查了通过电力和热电测量在不足的YBA $ _ {\ rm 2} $ cu $ _ {\ rm 3} $ o $ $ $ _ {\ rm y} $的情况下，通过电流（电气或热量$ a $ a $ a $ axiis the $ axiis the $ axiis of a $ axecs）相同的晶体，带孔掺杂$ p = 0.12 $。冷却后，我们在电阻率$ρ$或seebeck系数$ s $中没有观察到其他面积各向异性 - 超越背景各向异性 - 作为温度$ t^{\ star} $〜用于pseudogap阶段的发作。我们得出的结论是，丘比特的伪阶段不是否定的。但是，在低于$ t^{\ star} $的温度下，观察到了强大的额外各向异性，最明显的是，在Peltier系数$α= S /ρ$中。我们将其解释为与电荷顺序发展相关的nematicition。
Electronic nematicity is the spontaneous loss of rotational symmetry in a metal, without breaking translational symmetry. In the cuprate superconductors, there is experimental evidence for nematicity, but its origin remains unclear. Here we investigate the onset of nematicity in the transport of charge by means of electric and thermoelectric measurements in underdoped YBa$_{\rm 2}$Cu$_{\rm 3}$O$_{\rm y}$, performed by passing the current (electrical or thermal) first along the $a$ axis then the $b$ axis of the orthorhombic structure in the same crystal, with a hole doping $p = 0.12$. Upon cooling, we observe no additional in-plane anisotropy -- beyond the background anisotropy due to the CuO chains -- in either the resistivity $ρ$ or the Seebeck coefficient $S$ as the temperature $T^{\star}$~for the onset of the pseudogap phase is crossed. We conclude that the pseudogap phase of cuprates is not nematic. However, at temperatures much lower than $T^{\star}$, a strong additional anisotropy is observed, most clearly in the Peltier coefficient $α= S / ρ$. We interpret it as nematicity associated with the development of charge order.
