Investigation of the superconducting gap structure in SrFe2(As0.7P0.3)2 by magnetic penetration depth and flux flow resistivity analysis
Investigation of the superconducting gap structure in SrFe2(As0.7P0.3)2 by magnetic penetration depth and flux flow resistivity analysis
复制标题
通过磁穿透深度和磁通流电阻率分析研究SrFe2(As0.7P0.3)2中的超导间隙结构
DOI：
10.1103/physrevb.86.144525
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发表时间：
2012
影响因子：
3.7
通讯作者：
Y. Uwatoko and A. Maeda
中科院分区：
文献类型：
--
作者：
H. Takahashi;T. Okada;Y. Imai;K;Kitagawa;K. Matsubayashi;Y. Uwatoko and A. Maeda
测量了掺磷铁基超导体SrFe（AsP）单晶的微波表面阻抗，得到了单晶中的超流密度和磁通流电阻率。在低温下，超流密度服从幂律，分数指数为-1.6。在低磁场下，磁通流电阻率显著增强。这些特征与至少一个频带上的线节点的存在以及相同频带和/或其他频带上的具有深最小值的调制无节点间隙一致。实验中观察到的SrFe（AsP）和BaFe（AsP）超导带隙结构的显著差异，对阐明122系统铁基超导机制具有重要意义。
We measured the microwave surface impedances and obtained the superfluid density and flux flow resistivity in single crystals of a phosphor-doped iron-based superconductor SrFe(AsP)single crystals (,). At low temperatures, the superfluid density,, obeys a power law,, with a fractional exponent of–1.6. The flux flow resistivity was significantly enhanced at low magnetic fields. These features are consistent with the presence of line nodes on at least one band and modulated nodeless gap with deep minimum on the same bands and/or other bands. The remarkable difference observed in the superconducting gap structure between SrFe(AsP)and BaFe(AsP)in our experiments is important for clarifying the mechanism of iron-based superconductivity in the 122 system.