Competing orders and spin-density-wave instability in La(O1-xFx) FeAs
Competing orders and spin-density-wave instability in La(O1-xFx) FeAs
复制标题
La(O1-xFx) FeAs 中的竞争级数和自旋密度波不稳定性
DOI：
10.1209/0295-5075/83/27006
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发表时间：
2008-01-01
期刊：
影响因子：
1.8
通讯作者：
Wang, N. L.
中科院分区：
文献类型：
--
作者：
Dong, J.;Zhang, H. J.;Wang, N. L.
不同有序相之间的相互作用，如超导，电荷或自旋有序相，是凝聚态物理学的核心兴趣。最近在铁基氧铌酸盐La（O（1-x）F（x））FeAs中发现了T（c）= 26 K的超导电性（见Kamihara Y.例如，J. Am.化学会，130（2008）3296）对科学界来说是一个惊喜，并产生了巨大的兴趣。纯LaOFeAs本身不是超导的，但在150 K附近的电阻率和直流磁化率都显示出异常。在这里，我们提供了实验和理论相结合的证据表明，自旋密度波（SDW）状态的发展在低温下，与电子向列序。F的电子掺杂抑制了SDW的不稳定性，并诱导了超导电性。因此，La（O（1-x）F（x））FeAs提供了一个令人兴奋的新系统，在层状化合物中表现出竞争秩序。版权所有（C）EPLA，2008.
The interplay between different ordered phases, such as superconducting, charge or spin ordered phases, is of central interest in condensed-matter physics. The very recent discovery of superconductivity with a remarkable T(c) = 26K in Fe-based oxypnictide La(O(1-x)F(x)) FeAs (see Kamihara Y. et al., J. Am. Chem. Soc., 130 (2008) 3296) is a surprise to the scientific community and has generated tremendous interest. The pure LaOFeAs itself is not superconducting but shows an anomaly near 150K in both resistivity and dc magnetic susceptibility. Here we provide combined experimental and theoretical evidences showing that a spin-density-wave (SDW) state develops at low temperature, in association with electron Nematic order. The electron-doping by F suppresses the SDW instability and induces the superconductivity. Therefore, the La(O(1-x)F(x)) FeAs offers an exciting new system showing competing orders in layered compounds. Copyright (C) EPLA, 2008.