Observation of anisotropic diamagnetism above the superconducting transition in iron-pnictide Ba_(1-x)K_xFe2As2 single crystals due to thermodynamic fluctuations

Abstract

High resolution magnetization measurements performed in a high quality Ba_(1-x)K_xFe2As2 single crystal allowed to determine the diamagnetism induced above the superconducting transition by thermally activated Cooper pairs. These data, obtained with magnetic fields applied along and transverse to the crystal ab layers, demonstrate experimentally that the superconducting transition of iron pnictides may be explained at a phenomenological level in terms of the Gaussian Ginzburg-Landau approach for three-dimensional anisotropic superconductors.

Final version with minor corrections. 6 pages, 4 figures

References in corpus (8)

• High-temperature superconductivity in iron-based materials
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Direct evidence for a competition between the pseudogap and high temperature superconductivity in the cuprates
• Growth and characterization of A_{1-x}K_xFe_2As_2 (A = Ba, Sr) single crystals with x=0 - 0.4
• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Diamagnetism around the Meissner transition in a homogeneous cuprate single crystal
• Large $D-2$ Theory of Superconducting Fluctuations in a Magnetic Field and its Application to Iron-Pnictides
• Fluctuation diamagnetism around the superconducting transition in a cuprate crystal with a reduced Meissner fraction

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