Observation of anisotropic diamagnetism above the superconducting transition in iron pnictide Ba1−xKxFe2As2 single crystals due to thermodynamic fluctuations
J. Mosqueira, J. D. Dancausa, F. Vidal, S. Salem-Sugui, Jr., A. D. Alvarenga, H.-Q. Luo, Z.-S. Wang, H.-H. Wen
DOI 10.1103/PhysRevB.83.094519 · Physical Review B
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Abstract
High-resolution magnetization measurements performed in a high-quality Ba1−xKxFe2As2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba1-xKxFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 33.2 | Pressure not reported | midpoint |
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