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

Автор(и)

  • A.L. Solovjov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.N. Svetlov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • V.B. Stepanov B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
  • S.L. Sidorov A. Galkin Institute for Physics and Engineering of the National Academy of Sciences of Ukraine 72 R. Luxemburg, Donetsk 83114, Ukraine
  • V.Yu. Tarenkov A. Galkin Institute for Physics and Engineering of the National Academy of Sciences of Ukraine 72 R. Luxemburg, Donetsk 83114, Ukraine
  • A.I. D’yachenko A. Galkin Institute for Physics and Engineering of the National Academy of Sciences of Ukraine 72 R. Luxemburg, Donetsk 83114, Ukraine
  • A.B. Agafonov Institut für Festkörperphysik, Leibniz Universität, Hannover Appelstr. 2, D-30167 Hannover, Germany

DOI:

https://doi.org/10.1063/1.3630135

Ключові слова:

high-Tc superconductivity, FeAs-based superconductors, pseudogap, local pairs.

Анотація

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.

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Опубліковано

2011-05-19

Як цитувати

(1)
Solovjov, A.; Svetlov, V.; Stepanov, V.; Sidorov, S.; Tarenkov, V.; D’yachenko, A.; Agafonov, A. Possibility of Local Pair Existence in Optimally Doped SmFeAsO1-х in Pseudogap Regime. Fiz. Nizk. Temp. 2011, 37, 703-797.

Номер

Том 37 № 7 (2011)

Розділ

Надпровідність, зокрема високотемпературна