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Theoretical investigation of the superconducting gaps in the Fe-based superconductors

机译:Fe基超导体中超导间隙的理论研究

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Based on an antiferromagnetic (AFM) spin fluctuation approximation, we study the superconducting gaps in Fe-based compound using two-band model. We find that our results are consistent with the previous work that concludes sign-reversal extended s-wave pairings between different Fermi surface sheets. The different superconducting gap magnitude around different Fermi surface sheets is probably due to the different density of states on them. This calculation can give insight to the recent angle-resolved photoemission (ARPES) experiments on these materials. To detect the phase variation of the superconducting gap over the Fermi surfaces, we propose a new method for measuring the particular wave vector phonon linewidth. In the case of the sign-reversal superconducting pairing, the linewidth shows continuities compared to the case of no phase variation.
机译:基于反铁磁(AFM)自旋涨落近似,我们使用两波段模型研究了铁基化合物中的超导间隙。我们发现我们的结果与先前的工作一致,该工作得出了在不同费米表面之间的符号反转扩展s波对的结论。围绕不同费米表面片的超导间隙大小不同可能是由于它们上的状态密度不同所致。该计算可以洞察最近在这些材料上的角度分辨光发射(ARPES)实验。为了检测费米表面上超导间隙的相位变化,我们提出了一种测量特定波矢声子线宽的新方法。在符号反转超导对的情况下,与没有相位变化的情况相比,线宽显示出连续性。

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