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arXiv 2005.07233cond-mat.supr-con
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单层高温$_C$铜氧化物HgBa $_2$ CuO $_{4+δ}$中的三个相互作用能标度

Three interaction energy scales in single-layer high-T$_C$ cuprate HgBa$_2$CuO$_{4+δ}$

S. A. Sreedhar, Antonio Rossi, J. Nayak, Z. Anderson, Y. Tang, B. Gregory, M. Hashimoto, D. -H. Lu, E. Rotenberg, R. J. Birgeneau, M. Greven, M. Yi, I. M. Vishik

摘要:

层状铜酸盐超导体具有最高的环境压力超导转变温度(T $_C$),经过三十多年的非凡研究活动,继续提出艰巨的科学挑战。一个主要的实验障碍是区分普遍现象和依赖材料或技术的现象。角分辨光电子能谱(ARPES)测量动量相关的单粒子电子激发,并已在努力确定各向异性的动量空间性质的铜氧化物的无价的。HgBa $_2$ CuO $_{4+δ}$(Hg 1201)是一种单层CuO $_2$铜酸盐,具有特别高的最佳T $_C$和简单的晶体结构;然而,ARPES关于该模型系统的电子性质的信息很少。在这里,我们提出了一个ARPES研究掺杂,温度和动量依赖系统的近节色散异常Hg 1201。这些数据揭示了一个层次的三个不同的能量尺度-一个子间隙低能量扭结,一个中等能量扭结附近的55毫电子伏,和一个峰谷驼峰结构。前两个特征分别归因于电子与Ba衍生的光学声子和面内键伸缩声子的耦合。节点的峰,倾角,驼峰结构似乎有一个共同的掺杂依赖在几个单层铜氧化物,并解释为在节点的赝能隙物理的表现。这些结果建立了几个普遍的现象,无论是在连接多个实验技术的单一材料,并在连接可比的光谱特征在多个结构相似的铜酸盐。

英文摘要:

The lamellar cuprate superconductors exhibit the highest ambient-pressure superconducting transition temperatures (T$_C$) and, after more than three decades of extraordinary research activity, continue to pose formidable scientific challenges. A major experimental obstacle has been to distinguish universal phenomena from materials- or technique-dependent ones. Angle-resolved photoemission spectroscopy (ARPES) measures momentum-dependent single-particle electronic excitations and has been invaluable in the endeavor to determine the anisotropic momentum-space properties of the cuprates. HgBa$_2$CuO$_{4+δ}$ (Hg1201) is a single-CuO$_2$-layer cuprate with a particularly high optimal T$_C$ and a simple crystal structure; yet there exists little information from ARPES about the electronic properties of this model system. Here we present an ARPES study of doping-, temperature-, and momentum-dependent systematics of near-nodal dispersion anomalies in Hg1201. The data reveal a hierarchy of three distinct energy scales -a sub-gap low-energy kink, an intermediate-energy kink near 55 meV, and a peak-dip-hump structure. The first two features are attributed to the coupling of electrons to Ba-derived optical phonons and in-plane bond-stretching phonons, respectively. The nodal peak-dip-hump structure appears to have a common doping-dependence in several single-layer cuprates, and is interpreted as a manifestation of pseudogap physics at the node. These results establish several universal phenomena, both in terms of connecting multiple experimental techniques for a single material, and in terms of connecting comparable spectral features in multiple structurally similar cuprates.

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