Physics – Condensed Matter – Superconductivity
Scientific paper
2012-03-29
New Journal of Physics 14, 043001 (2012)
Physics
Condensed Matter
Superconductivity
12 pages, 5 figures
Scientific paper
Paraconductivity of the optimally K-doped SrFe2As2 superconductor is investigated within existing fluctuation mechanisms. The in-plane excess conductivity has been measured in high quality single crystals, with a sharp superconducting transition at Tc=35.5K and a transition width less than 0.3K. The data have been also acquired in external magnetic field up to 14T. We show that the fluctuation conductivity data in zero field and for temperatures close to Tc, can be explained within a three-dimensional Lawrence-Doniach theory, with a negligible Maki-Thompson contribution. In the presence of the magnetic field, it is shown that paraconductivity obeys the three-dimensional Ullah-Dorsey scaling law, above 2T and for H||c. The estimated upper critical field and the coherence length nicely agree with the available experimental data.
Chen Guo-Feng
Li Zaidong
Luo Jian-Lin
Marra P.
Nigro Alessandro
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