Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor
Inhomogeneity of charge-density-wave order and quenched disorder in a high-Tc superconductor
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DOI：
10.1038/nature14987
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发表时间：
2015-09-17
期刊：
影响因子：
64.8
通讯作者：
Ricci, A.
中科院分区：
文献类型：
--
作者：
Campi, G.;Bianconi, A.;Ricci, A.
最近已经确定，高转变温度（高T-c）超导态与短程电荷密度波序（1-11）和由掺杂剂和应变（14-17）引起的淬灭无序（12，13）共存。这种复杂的、多尺度的相分离（18-21）引发了包括复杂性在内的高温超导理论的发展（22-25）。电荷和掺杂剂顺序之间的空间相互作用的性质，提供了纳米级相分离的基础仍然是一个关键的开放问题，因为实验还没有探测未知的空间分布在纳米级和介观尺度（原子和宏观尺度之间）。在这里，我们报告了短程电荷密度波“水坑”（只有几个波长的域）和淬灭无序HgBa 2CuO 4 +y的空间分布的微观X射线衍射成像，单层铜酸盐具有最高的Tc，95开尔文（参考文献26-28）。我们发现，电荷密度波水坑，就像沸水中的蒸汽泡一样，具有厚尾尺寸分布，这是临界点附近自组织的典型特征（19）。然而，猝灭的无序，这是由氧化合物，有一个分布，这是相反的，通常假设的随机，不相关的分布（12，13）。富氧畴在空间上与电荷密度波畴相关，因为更高的掺杂不利于条状电荷密度波水坑，导致超导空间景观的复杂涌现几何形状。
It has recently been established that the high-transition-temperature (high-T-c) superconducting state coexists with short-range charge-density-wave order(1-11) and quenched disorder(12,13) arising from dopants and strain(14-17). This complex, multiscale phase separation(18-21) invites the development of theories of high-temperature superconductivity that include complexity(22-25). The nature of the spatial interplay between charge and dopant order that provides a basis for nanoscale phase separation remains a key open question, because experiments have yet to probe the unknown spatial distribution at both the nanoscale and mesoscale (between atomic and macroscopic scale). Here we report micro X-ray diffraction imaging of the spatial distribution of both short-range charge-density-wave 'puddles' (domains with only a few wavelengths) and quenched disorder in HgBa2CuO4+y, the single-layer cuprate with the highest T-c, 95 kelvin (refs 26-28). We found that the charge-density-wave puddles, like the steam bubbles in boiling water, have a fat-tailed size distribution that is typical of self-organization near a critical point(19). However, the quenched disorder, which arises from oxygen interstitials, has a distribution that is contrary to the usually assumed random, uncorrelated distribution(12,13). The interstitial-oxygen-rich domains are spatially anticorrelated with the charge-density-wave domains, because higher doping does not favour the stripy charge-density-wave puddles, leading to a complex emergent geometry of the spatial landscape for superconductivity.