Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO

Details Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO

2009-02-06

arxiv.org/abs/0902.1066v1

Phys. Rev. B 79, 104515 (2009)

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures, 3 tables Submitted to Phys.Rev.B

Scientific paper

10.1103/PhysRevB.79.104515

We measure magnetotransport of F doped SmFeAsO samples up to 28T and we extract the upper critical fields, using different criteria. In order to circumvent the problem of criterion-dependence Hc2 values, we suggest a thermodynamic estimation of the upper critical field slope dHc2/dT based on the analysis of conductivity fluctuations in the critical regime. A high field slope as large as -12T/K is thus extracted for the optimally doped sample. We find evidence of a two-dimensional lowest Landau level (LLL) scaling for applied fields larger than mu_0H_LLL=8T. Finally, we estimate the coherence length values and we observe that they progressively increase with decreasing Tc. In all cases, the coherence length values along the c axis are smaller than the interplanar distance, confirming the two-dimensional nature of superconductivity in this compound.

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