Anisotropic s-Wave Gap in the Vicinity of a Quantum Critical Point in Superconducting BaFe2(As1–x
P
x
)2 Single Crystals: A Study of Point-Contact Spectroscopy
Hong-Xing 红星 Zhan 詹,
Yu-Chi 玉尺 Lin 林,
Yu-Qing 宇清 Zhao 赵
et al.
Abstract:Here we report on soft $c$-axis point-contact Andreev reflection (PCAR) spectroscopy combining with resistivity measurements on BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$, to elucidate the superconducting gap structure in the vicinity of the QCP. A double-peak at the gap edge plus a dip feature at zero-bias has been observed on the PCAR spectra, indicative of the presence of a nodeless gap in BaFe$_2$(As$_{0.7}$P$_{0.3}$)$_2$. Detailed analysis within a sophisticated theoretical model reveal an anisotropic gap with de… Show more
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