Superconducting fluctuations in isovalently substituted BaFe2(As1−xPx)2: Possible observation of multiband effects

Abstract

The nature of superconducting fluctuation effects in the isovalently substituted iron pnictide BaFe2(As1−xPx)2(x≈0.35) is probed through measurements of the magnetization and magnetoconductivity around the superconducting transition. The results, obtained with magnetic fields up to 9 T applied in the two main crystal directions, are consistent with anisotropic Ginzburg-Landau (GL) approaches for finite applied magnetic fields. The analysis allowed us to determine with accuracy the out-of-plane, ξc(0), and in-plane, ξab(0), GL coherence lengths. Significant differences are found between the ξc(0) values resulting from electrical transport and magnetization data. According to recent theoretical approaches, these differences could be interpreted in terms of the multiband nature of this material. The analysis of data in the low-field region around the transition temperature also suggests that phase fluctuations, although possibly relevant in other Fe-based superconductors, may play a negligible role in this compound.

Source-reported materials — not catalogue approval

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