Non-conventional superconducting fluctuations in Ba(Fe1-xRhx)2As2 iron-based superconductors

Abstract

We measured the static uniform spin susceptibility of Ba(Fe${}_{1-x}$Rh${}_x$)${}_2$As${}_2$ iron-based superconductors, over a broad range of doping ($0.041\le x\le 0.094$) and magnetic fields. At small fields ($H\le$ 1 kOe) we observed, above the transition temperature $T_c$, the occurrence of precursor diamagnetism, which is not ascribable to the Ginzburg-Landau theory. On the contrary, our data fit a phase fluctuation model, which has been used to interpret a similar phenomenology occurring in the high-$T_c$ cuprate superconductors. On the other hand, in presence of strong fields the unconventional fluctuating diamagnetism is suppressed, whereas 3D fluctuations are found, in agreement with literature.

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• Superconducting fluctuations in isovalently-substituted BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$: Possible observation of multiband effects
• Quasi-2D behavior of 112-type iron-based superconductors
• Quantum Criticality in the 122 Iron Pnictide Superconductors Emerging from Orbital-Selective Mottness
• Multiband effects on the upper critical field angular dependence of 122-family iron pnictide superconductors
• Fluctuation Diamagnetism in Two-Band Superconductors