Possibility of local pair existence in optimally doped SmFeAsO₁₋х in pseudogap regime

• Published in: Физика низких температур
• Date: 2011
• Main Authors: Solovjov, A.L., Svetlov, V.N., Stepanov, V.B., Sidorov, S.L., Tarenkov, V.Yu., D’yachenko, A.I., Agafonov, A.B.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2011
• Subjects: Сверхпроводимость, в том числе высокотемпературная
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/118617
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Possibility of local pair existence in optimally doped SmFeAsO₁₋х in pseudogap regime / A.L. Solovjov, V.N. Svetlov, V.B. Stepanov, S.L. Sidorov, V.Yu. Tarenkov, A.I. D’yachenko, A.B. Agafonov // Физика низких температур. — 2011. — Т. 37, № 7. — С. 703–707. — Бібліогр.: 37 назв. — англ.

We report the analysis of pseudogap Δ* derived from resistivity experiments in FeAs-based superconductor SmFeAsO₀.₈₅, having a critical temperature Tc=55 K. Rather specific dependence Δ*(T) with two representative temperatures followed by a minimum at about 120 K was observed. Below Ts ≈ 147 K, corresponding to the structural transition in SmFeAsO, Δ*(T) decreases linearly down to the temperature TAFM ≈ 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 theory developed for the AFM superconductors.