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arXiv 1202.0329cond-mat.supr-con
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Fe1 + xSe1-y、Fe1 + xSe1-yTey和(K/Rb/Cs)zFe2 -xSe2的超导Transition Temperatures

The Superconducting Transition Temperatures of Fe1+xSe1--y, Fe1+xSe1--yTey and (K/Rb/Cs)zFe2--xSe2

Dale R. Harshman, Anthony T. Fiory

摘要:

在最近对该杂志的投稿中,表明最佳高Tc化合物的转变温度服从代数关系,Tc 0 = kB-1β/ \ell,其中\ell与层中相互作用电荷之间的平均间距有关,β是相互作用电子层之间的距离,β是普适常数,kB是玻尔兹曼常数。该方程是基于物理分离的电荷之间的层间库仑相互作用假设配对导出的。这一理论最初验证了31个化合物从五个不同的高Tc家庭(在\pm 1.37 K的准确度)。本文中,我们报告了添加Fe 1 + xSe 1-y和Fe 1 + xSe 1-yTey(均在压力下优化)和AzFe 2-xSe 2(对于A = K,Rb或Cs)到库仑介导的超导化合物的不断增长的列表中,其中Tc 0由上述方程确定。这些材料中的掺杂通过引入过量的Fe和/或Se缺陷或碱金属和Fe空位的组合来实现。因此,非常少量的空位或杂质可以诱导具有相当大的转变温度的超导状态。上述公式对于这些Se基Fe硫属化物的确认将可以准确预测转变温度的超导族的数量增加到六个。

英文摘要:

In a recent contribution to this journal, it was shown that the transition temperatures of optimal high-Tc compounds obey the algebraic relation, Tc0 = kB-1β/\ellζ, where \ell is related to the mean spacing between interacting charges in the layers, ζ is the distance between interacting electronic layers, β is a universal constant and kB is Boltzmann's constant. The equation was derived assuming pairing based on interlayer Coulomb interactions between physically separated charges. This theory was initially validated for 31 compounds from five different high-Tc families (within an accuracy of \pm1.37 K). Herein we report the addition of Fe1+xSe1-y and Fe1+xSe1-yTey (both optimized under pressure) and AzFe2-xSe2 (for A = K, Rb, or Cs) to the growing list of Coulomb-mediated superconducting compounds in which Tc0 is determined by the above equation. Doping in these materials is accomplished through the introduction of excess Fe and/or Se deficiency, or a combination of alkali metal and Fe vacancies. Consequently, a very small number of vacancies or interstitials can induce a superconducting state with a substantial transition temperature. The confirmation of the above equation for these Se-based Fe chalcogenides increases to six the number of superconducting families for which the transition temperature can be accurately predicted.

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