Abstract
The magnetization around the superconducting transition was recently measured in a high-quality Ba1−x K x Fe2As2 single crystal with magnetic fields applied along and transverse to the crystal Fe-layers [J. Mosqueira et al. in Phys. Rev. B 83:094519, 2011]. Here we extend this study to the finite-field (or Prange) regime, in which the magnetic susceptibility is expected to be strongly dependent on the applied magnetic field. These measurements are analyzed in the framework of the three-dimensional anisotropic Ginzburg–Landau (3D-aGL) approach generalized to the short-wavelength regime through the introduction of a total-energy cutoff in the fluctuation spectrum. The results further confirm the adequacy of GL approaches to describe the fluctuation effects close to the superconducting transition of these materials.
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Acknowledgements
This work was supported by the Spanish MICINN and ERDF (grant no. FIS2010-19807), the Xunta de Galicia (grants no. 2010/XA043 and 10TMT206012PR), and the European project ENERMAT. SSS and ADA acknowledge support from the CNPq and FAPERJ.
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Mosqueira, J., Dancausa, J.D., Carballeira, C. et al. Three-Dimensional Anisotropic Fluctuation Diamagnetism Around the Superconducting Transition of Ba1−x K x Fe2As2 Single Crystals in the Finite-Field (or Prange) Regime. J Supercond Nov Magn 26, 1217–1220 (2013). https://doi.org/10.1007/s10948-012-1862-0
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DOI: https://doi.org/10.1007/s10948-012-1862-0