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Intrinsic high-temperature superconductivity in ternary iron selenides

机译:三元硒化铁的本征高温超导

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摘要

We examine superconductivity in the mesoscopically mixed antiferromagnetic (AF) and superconducting (SC) phases of ternary iron selenides K_yFe_(2-x)Se_2. It is shown that the interlayer hopping and AF order are key factors to determine T_C of the SC phase. In general, the hopping will produce deformed Fermi surfaces (FSs) that tend to suppress superconductivity. However, contrary to the common expectation, we find that larger AF order actually results in larger SC order, which explains the observed relatively high T_C in these phases. Furthermore, our results indicate that by reducing the interlayer hopping appropriately, phase-separated K_yFe_(2-x)Se_2 may exhibit its intrinsic SC phase in the two-dimensional limit with a much higher T_C (~ 65 K) than what has been observed.
机译:我们研究了三元硒化铁K_yFe_(2-x)Se_2的介观混合反铁磁(AF)和超导(SC)相中的超导性。结果表明,层间跳变和AF顺序是确定SC相T_C的关键因素。通常,跳变会产生变形的费米表面(FSs),这些表面倾向于抑制超导性。但是,与通常的预期相反,我们发现较大的AF阶实际上会导致较大的SC阶,这解释了在这些阶段观察到的相对较高的T_C。此外,我们的结果表明,通过适当地减少层间跳变,相分离的K_yFe_(2-x)Se_2可能在二维极限内表现出其固有的SC相,其T_C(〜65 K)比所观察到的要高得多。 。

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  • 来源
    《Physical review》 |2013年第17期|174510.1-174510.7|共7页
  • 作者单位

    Department of Physics, National Tsing Hua University, Hsinchu 30043, Taiwan;

    Department of Physics, National Tsing Hua University, Hsinchu 30043, Taiwan,Institute of Physics, Academia Sinica, Nankang, Taiwan,Physics Division, National Center for Theoretical Sciences, P.O. Box 2-131, Hsinchu, Taiwan;

    Institute of Physics, Academia Sinica, Nankang, Taiwan;

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