A Mott insulator continuously connected to iron pnictide superconductors.

A Mott insulator continuously connected to iron pnictide superconductors.
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连续连接到铁磷族超导体的莫特绝缘体

DOI:
10.1038/ncomms13879
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发表时间:
2016-12-19
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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铁基超导性在反铁磁序附近发展,并且脱离了不良金属正常状态,这被解释为源自近似莫特转变。是否可以在铁磷族化物的相图中实现实际的莫特绝缘体仍然是一个悬而未决的问题。在这里,我们使用输运、透射电子显微镜、X射线吸收光谱、共振非弹性X射线散射和中子散射来证明NaFe1−xCuxAs接近x≈0.5表现出实空间Fe和Cu有序性,并且是反铁磁绝缘体,其绝缘行为持续高于尼尔温度,表明莫特绝缘体。当 x 从 0.5 开始减小时,反铁磁有序矩不断减小,产生超导性 ∼x=0.05。我们在NaFe1−xCuxAs中发现的莫特绝缘态使其成为唯一已知的铁基材料,其中超导性可以平滑地连接到莫特绝缘态,凸显了电子相关性在高温超导中的重要作用。
Iron-based superconductivity develops near an antiferromagnetic order and out of a bad-metal normal state, which has been interpreted as originating from a proximate Mott transition. Whether an actual Mott insulator can be realized in the phase diagram of the iron pnictides remains an open question. Here we use transport, transmission electron microscopy, X-ray absorption spectroscopy, resonant inelastic X-ray scattering and neutron scattering to demonstrate that NaFe1−xCuxAs nearx≈0.5 exhibits real space Fe and Cu ordering, and are antiferromagnetic insulators with the insulating behaviour persisting above the Néel temperature, indicative of a Mott insulator. On decreasingxfrom 0.5, the antiferromagnetic-ordered moment continuously decreases, yielding to superconductivity ∼x=0.05. Our discovery of a Mott-insulating state in NaFe1−xCuxAs thus makes it the only known Fe-based material, in which superconductivity can be smoothly connected to the Mott-insulating state, highlighting the important role of electron correlations in the high-Tcsuperconductivity.
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