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arXiv 1106.2437cond-mat.supr-con
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Fe基超导体Ba_(1-x)Rb_(x)Fe2As2中磁穿透深度的μ子旋转测量

Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2

Z. Guguchia, Z. Shermadini, A. Amato, A. Maisuradze, A. Shengelaya, Z. Bukowski, H. Luetkens, R. Khasanov, J. Karpinski, H. Keller

摘要:

用μ子自旋旋转μ SR技术测量了铁基超导体Ba_(1-x)Rb_xFe_2As_2(x=0.3,0.35,0.4)的磁穿透深度(λ)。λ的温度依赖性很好地描述了一个两个间隙s+ s波的情况下,一个小的间隙Δ_1 = 1 - 3 mev和一个大的间隙Δ_2 = 7 - 9 mev。将本文的结果与RbFe_2As_2的结果相结合,观察到BCS比2 Δ_2/(k_B)(T_c)随Rb含量x的增加而减小。另一方面,BCS比2 Δ_1/(k_B)(T_c)几乎与x无关。此外,还发现Δ_1对超流密度的贡献随x的增加而增加。这些结果进行了讨论,在空穴掺杂时的带间过程的抑制。

英文摘要:

Measurements of the magnetic penetration depth (lambda) in the Fe-based superconductor Ba_(1-x)Rb_xFe_2As_2 (x=0.3, 0.35, 0.4) were carried out using the muon-spin rotation muSR technique. The temperature dependence of lambda is well described by a two-gap s+s-wave scenario with a small gap Delta_1 = 1 - 3 mev and a large gap Delta_2 = 7 - 9 mev. By combining the present data with those obtained for RbFe_2As_2 a decrease of the BCS ratio 2Delta_2/(k_B)(T_c) with increasing Rb content x is observed. On the other hand, the BCS ratio 2Delta_1/(k_B)(T_c) is almost independent of x. In addition, the contribution of Delta_1 to the superfluid density is found to increase with x. These results are discussed in the light of the suppression of interband processes upon hole doping.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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