Possibility of local pair existence in optimally doped SmFeAsO(1-x) in pseudogap regime

Details Possibility of local pair existence in optimally doped SmFeAsO(1-x) in pseudogap regime Possibility of local pair existence in optimally doped SmFeAsO(1-x) in pseudogap regime

2010-12-06

arxiv.org/abs/1012.1252v1

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures

Scientific paper

We report the analysis of pseudogap Delta* derived from resistivity experiments in FeAs-based superconductor SmFeAsO(0.85), having a critical temperature T_c = 55 K. Rather specific dependence Delta*(T) with two representative temperatures followed by a minimum at about 120 K was observed. Below T_s = 147 K, corresponding to the structural transition in SmFeAsO, Delta*(T) decreases linearly down to the temperature T_AFM = 133 K. This last peculiarity can likely be attributed to the antiferromagnetic (AFM) ordering of Fe spins. It is believed that the found behavior can be explained in terms of Machida, Nokura, and Matsubara (MNM) theory developed for the AFM superconductors.

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