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:
文献类型:
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作者:
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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DOI:
10.1073/pnas.1318045111
发表时间:
2014-03-18
影响因子:
11.1
作者:
Katase, Takayoshi;Hiramatsu, Hidenori;Hosono, Hideo
通讯作者:
Hosono, Hideo
影响因子:
8.6
作者:
Matt, C. E.;Xu, N.;Shi, M.
通讯作者:
Shi, M.
影响因子:
44.1
作者:
Scalapino, D. J.
通讯作者:
Scalapino, D. J.
影响因子:
--
作者:
MOON, RM;RISTE, T;KOEHLER, WC
通讯作者:
KOEHLER, WC
影响因子:
3.7
作者:
Li, Shiliang;de la Cruz, Clarina;Dai, Pengcheng
通讯作者:
Dai, Pengcheng