Direct evidence for charge stripes in a layered cobalt oxide.
Direct evidence for charge stripes in a layered cobalt oxide.
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DOI：
10.1038/ncomms11632
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发表时间：
2016-05-23
影响因子：
16.6
通讯作者：
Boothroyd AT
中科院分区：
文献类型：
--
作者：
Babkevich P;Freeman PG;Enderle M;Prabhakaran D;Boothroyd AT
最近的实验表明，静态条纹状电荷顺序是空穴掺杂氧化铜超导体所共有的，并与超导性相竞争。在这里，我们表明在La5/3Sr1/3CoO4中存在类似类型的电荷顺序，La5/3Sr1/3CoO4是一种含钴代替铜的铜氧化物超导体的绝缘类似物。我们检测到的条纹相伴随着短程、准一维、反铁磁有序，并为之前在La2−xSrxCoO4和许多空孔掺杂铜氧化物超导体的中子散射测量中观察到的独特的沙漏形状磁谱提供了自然的解释。研究结果为建立在短距离准静态条纹相关上的沙漏谱理论奠定了坚实的经验基础。在高温超导体中产生沙漏状磁谱的磁性基态的性质是一个有争议的问题。在这里，Babkevich等人在La5/3Sr1/3CoO4中检测到条纹荷序伴随着准一维反铁磁序的存在，为这种特征谱提供了一个自然的解释。
Recent experiments indicate that static stripe-like charge order is generic to the hole-doped copper oxide superconductors and competes with superconductivity. Here we show that a similar type of charge order is present in La5/3Sr1/3CoO4, an insulating analogue of the copper oxide superconductors containing cobalt in place of copper. The stripe phase we have detected is accompanied by short-range, quasi-one-dimensional, antiferromagnetic order, and provides a natural explanation for the distinctive hourglass shape of the magnetic spectrum previously observed in neutron-scattering measurements of La2−xSrxCoO4 and many hole-doped copper oxide superconductors. The results establish a solid empirical basis for theories of the hourglass spectrum built on short-range, quasi-static, stripe correlations. The nature of the magnetic ground state giving rise to the hourglass-shaped magnetic spectrum common among high-Tc superconductors is a matter of debate. Here, Babkevich et al. detect the presence of stripe charge order accompanied by quasi-one-dimensional antiferromagnetic order in La5/3Sr1/3CoO4, providing a natural explanation for this characteristic spectrum.