Nematicity in the pseudogap state of cuprate superconductors revealed by angle-resolved photoemission spectroscopy
Nematicity in the pseudogap state of cuprate superconductors revealed by angle-resolved photoemission spectroscopy
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角分辨光电子能谱揭示铜酸盐超导体赝能隙态的向列性
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
A. Fujimori
中科院分区：
文献类型：
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作者：
S. Nakata;M. Horio;K. Koshiishi;K. Hagiwara;C. Lin;M. Suzuki;S. Ideta;K. Tanaka;D. Song;Y. Yoshida;H. Eisaki;A. Fujimori
赝能隙与超导电性的关系是铜氧化物超导体研究的中心问题之一。最近，一种可能的情况已经提出，赝能隙态是一个独特的阶段，其特征在于自发旋转对称性破缺称为“向列性”的基础上的运输和磁性测量，其中观察到的对称性破缺低于赝能隙温度$T^*$。利用ARPES方法研究了Bi${}_{1.7}$Pb${}_{0.5}$Sr${}_{1.9}$CaCu${}_2$O${}_{8+delta}$在沿着Cu-O键方向施加单轴应变时的向列性.虽然向列性增强的赝隙状态，在以前的研究中，它被抑制在超导状态。这些结果表明赝能隙态具有自发旋转对称破缺的特征，向列性可能与超导性竞争。这些新的实验发现可能为向列性的本质及其与超导电性的关系提供线索。
The relationship between the pseudogap and superconductivity is one of the central issues for cuprate superconductors. Recently, a possible scenario has been proposed that the pseudogap state is a distinct phase characterized by spontaneous rotational symmetry breaking called "nematicity" based on transport and magnetic measurements where the symmetry breaking was observed below the pseudogap temperature $T^*$. Here, we report a temperature-dependent ARPES study of nematicity in Bi${}_{1.7}$Pb${}_{0.5}$Sr${}_{1.9}$CaCu${}_2$O${}_{8+delta}$ triggered by a uniaxial strain applied along the Cu-O bond direction. While the nematicity was enhanced in the pseudogap state as in the previous studies, it was suppressed in the superconducting state. These results indicate that the pseudogap state is characterized by spontaneous rotational symmetry breaking and that the nematicity may compete with superconductivity. These new experimental insights may provide clues for the nature of the nematicity and its relation to the superconductivity.