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arXiv 1402.1833cond-mat.supr-con
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BiS2-based超导体中小费米面谱的反常温度依赖性观察

Observation of anomalous temperature dependence of spectrum on small Fermi surfaces in a BiS2-based superconductor

L. K. Zeng, X. B. Wang, J. Ma, P. Richard, S. M. Nie, H. M. Weng, N. L. Wang, Z. Wang, T. Qian, H. Ding

摘要:

我们进行了角分辨光电子能谱研究的BiS2基超导体Nd(O,F)BiS2。两个小的类电子费米面周围的X(π,0)观察到,其中包围布里渊区面积的2.4%和1.1%,分别对应于每个Bi站点的电子掺杂7%。低能谱由一个弱色散的宽峰和一个色散分支组成,与计算的能带色散很好地吻合。随着温度的升高,这种驼峰被大大抑制,而色散分支基本上不受影响。反常的热效应表明一个高度相互作用的电子状态,在其中超导配对的发展。

英文摘要:

We performed an angle-resolved photoemission spectroscopy study of the BiS2-based superconductor Nd(O,F)BiS2. Two small electron-like Fermi surfaces around X (pi, 0) are observed, which enclose 2.4% and 1.1% of the Brillouin zone area, respectively, corresponding to an electron doping of 7% per Bi site. The low-energy spectrum consists of a weakly-dispersing broad hump and a dispersive branch, which follows well the calculated band dispersion. This hump is drastically suppressed with increasing temperature, while the dispersive branch is essentially unaffected. The anomalous thermal effect indicates a highly interacting electronic state, in which the superconducting pairing develops.

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