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标题：Superconducting-Gap Anisotropy of Iron Pnictides Investigated via Combinatorial Microwave Measurements
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作者：Tatsunori Okada ; Yoshinori Imai ; Kentaro Kitagawa 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-7
DOI：10.1038/s41598-020-63304-0
出版社：Springer Nature
摘要：One of the most significant issues for superconductivity is clarifying the momentum-dependent superconducting gap Δ($${ oldsymbol{k}}$$), which is closely related to the pairing mechanism. To elucidate the gap structure, it is essential to investigate Δ($${ oldsymbol{k}}$$) in as many different physical quantities as possible and to crosscheck the results obtained in different methods with each other. In this paper, we report a combinatorial investigation of the superfluid density and the flux-flow resistivity of iron-pnictide superconductors; LiFeAs and BaFe2(As1−xPx)2 (x = 0.3, 0.45). We evaluated Δ($${ oldsymbol{k}}$$) by fitting these two-independent quantities with a two-band model simultaneously. The obtained Δ($${ oldsymbol{k}}$$) are consistent with the results observed in angle-resolved photoemission spectroscopy (ARPES) and scanning-tunneling spectroscopy (STS) studies. We believe our approach is a powerful method for investigating Δ($${ oldsymbol{k}}$$) because it does not require a sample with clean surface unlike ARPES and STS experiments, or a rotational magnetic-field system for direct measurements of the angular dependence of thermodynamic quantities.