Using incoherent multiple Andreev reflection effect spectroscopy, we have studied the multiple-gap superconducting state of underdoped and overdoped Na(Fe, Co)As single crystals. We directly determined the magnitudes of the microscopic superconducting order parameters, their temperature dependences, and characteristic ratios 2Δ(0)/kBTc. The obtained large data statistics unambiguously proves a significant decrease in the degree of the large superconducting gap possible anisotropy in the overdoped compositions away from the antiferromagnetic and nematic regions of the do** phase diagram.
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Kuzmichev, S.A., Morozov, I.V., Shilov, A.I. et al. Do** Evolution of the Superconducting Order Parameter of Na(Fe, Co)As Alkali-Metal Pnictides. Jetp Lett. (2024). https://doi.org/10.1134/S0021364024602008
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DOI: https://doi.org/10.1134/S0021364024602008