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首页> 外文期刊>Physica, C. Superconductivity and its applications >Anisotropic London penetration depth and superfluid density in single crystals of iron-based pnictide superconductors
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Anisotropic London penetration depth and superfluid density in single crystals of iron-based pnictide superconductors

机译：铁基磷化物超导体在单晶中的各向异性伦敦渗透深度和超流密度

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In- and out-of-plane magnetic penetration depths were measured in three iron-based pnictide superconducting systems. The "122" system was represented by electron-doped Ba(Fe1-xCox)(2)As-2 with the doping through the whole phase diagram with x approximate to 0.038, 0.047, 0.058, 0.074 and 0.10 (T-c ranged from 13 to 24 K) and by hole-doped (Ba1-xKx)Fe2As2 with doping close to optimal, with measured x approximate to 0.45 (T-c approximate to 28 K) and an underdoped sample with x approximate to 0.15 (T-c approximate to 19 K). The"1111" system was represented by single crystals of NdFeAs(O1-xFx) with nominal x=0.1 (T-c approximate to 43 K). All studied samples of both 122 systems show a robust power-law behavior, lambda(T) proportional to T-n, with the sample-dependent exponent n = 2-2.5, which is indicative of unconventional pairing. This scenario could be possible either through scattering in a S, state or due to nodes in the superconducting gap. In the Nd-1111 system, the interpretation of the results is complicated by magnetism of the rare-earth ions. For all three systems, the anisotropy ratio, gamma(lambda) equivalent to lambda(c)/lambda(ab), was found to decrease with increasing temperature, whereas the anisotropy of the coherence lengths, gamma(zeta) equivalent to xi(ab)/xi(c) = H-c2(perpendicular to c)/H-c2(parallel to c), has been found to increase (both opposite to the trend in two-band MgB2). The overall anisotropy of the pnictide superconductors is small, in fact much smaller than that of the cuprates (except YBa2Cu3O7-x (YBCO)). The 1111 system is about two times more anisotropic than the 122 system. Our data and analysis suggest that the iron-based pnictides are complex superconductors in which a multiband three-dimensional electronic structure and strong magnetic fluctuations play important roles. (C) 2009 Elsevier B.V. All rights reserved.
机译：在三个铁基肽超导系统中测量了面内和面外磁渗透深度。 “ 122”系统由掺杂电子的Ba（Fe1-xCox）（2）As-2表示，整个相图中的掺杂量均x分别约为0.038、0.047、0.058、0.074和0.10（Tc范围为13 24 K）和空穴掺杂（Ba1-xKx）Fe2As2，掺杂接近于最佳值，测量的x约为0.45（Tc约为28 K），而掺杂不足的样品的x约为0.15（Tc约为19 K）。 “ 1111”系统由标称x ＝ 0.1（T-c约43K）的NdFeAs（O1-xFx）单晶表示。两个122个系统的所有研究样本均显示出鲁棒的幂律行为，lambda（T）与T-n成正比，样本相关指数n = 2-2.5，这表明非常规配对。通过以S状态散射或由于超导间隙中的结点，这种情况都是可能的。在Nd-1111系统中，稀土离子的磁性使结果的解释变得复杂。对于所有三个系统，发现各向异性比率gamma（lambda）等于lambda（c）/ lambda（ab）随着温度的升高而减小，而相干长度的各向异性gamma（zeta）等于xi（ab） ）/ xi（c）= H-c2（垂直于c）/ H-c2（平行于c），已经发现增加（两者与两波段MgB2的趋势相反）。磷化物超导体的整体各向异性很小，实际上比铜酸盐的各向异性小得多（YBa2Cu3O7-x（YBCO）除外）。 1111系统的各向异性约为122系统的两倍。我们的数据和分析表明，铁基肽是复杂的超导体，其中多波段三维电子结构和强烈的磁起伏起着重要作用。 （C）2009 Elsevier B.V.保留所有权利。

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