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Superconductivity-Insensitive Order at q ～ 1 / 4 in Electron-Doped Cuprates

机译：在电子掺杂铜酸盐中Q〜1/4的超导不敏感令

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One of the central questions in the cuprate research is the nature of the normal state that develops into high-temperature superconductivity (HTSC). In the normal state of hole-doped cuprates, the existence of a charge density wave (CDW) is expected to shed light on the mechanism of HTSC. With evidence emerging for CDW order in the electron-doped cuprates, the CDW is thought to be a universal phenomenon in high- T c cuprates. However, the CDW phenomena in electron-doped cuprates are quite different than those in hole-doped cuprates. Here, we study the nature of the putative CDW in an electron-doped cuprate through direct comparisons between as-grown and postannealed Nd 1.86 Ce 0.14 CuO 4 (NCCO) single crystals using Cu L 3 -edge resonant soft x-ray scattering (RSXS) and angle-resolved photoemission spectroscopy (ARPES). The RSXS result reveals that the nonsuperconducting NCCO shows the same reflections at the wave vector ( ～ 1 / 4 , 0, l ) as the reported superconducting NCCO. This superconductivity-insensitive signal is quite different from the CDW reflection in hole-doped cuprates. Moreover, the ARPES result suggests that the fermiology cannot account for such wave vectors. These results call into question the universality of the CDW phenomenon in the cuprates.
机译：铜酸铜研究中的一个中枢性问题是发展成高温超导性（HTSC）的正常状态的性质。在孔掺杂铜酸铜的正常状态下，预期电荷密度波（CDW）的存在对HTSC的机制脱光。有了在电子掺杂的铜酸盐中出现CDW顺序的证据，CDW被认为是高于高铜酸盐的普遍现象。然而，电子掺杂铜酸铜中的CDW现象与孔掺杂铜酸酯中的CDW现象相比。在这里，我们通过使用Cu L 3 -Edeed谐振软X射线散射（RSX），通过生长和后未生长的Nd 1.86 Ce0.14（NCCO）单晶的直接比较来研究推定的CDW的性质）和角度分辨的光曝光光谱（ARPES）。 RSX结果表明，非耗电线NCCO在波向量（〜1/4，0，L）上显示相同的反射，作为报告的超导NCCO。这种超导不敏感信号与孔掺杂铜酸酯的CDW反射有很大不同。此外，ARPes结果表明，神经技能不能考虑这种波矢量。这些结果调查了铜替代物中CDW现象的普遍性。

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