Physics – Condensed Matter – Superconductivity
Scientific paper
2009-05-22
J. Phys. Soc. J. 78 (2009) 103701
Physics
Condensed Matter
Superconductivity
Title was changed
Scientific paper
10.1143/JPSJ.78.103701
We microscopically examine the intergrain Josephson current in iron-pnictide superconductors in order to solve the puzzle of why the intergrain current is much lower than the intragrain one. The theory predicts that the intergrain Josephson current is significantly reduced by the $\pm$s-wave symmetry when the incoherent tunneling becomes predominant and the density of states and the gap amplitude between two bands are identical. We find in such a situation that the temperature dependence of the intergrain Josephson current shows an anomalously flat curve over a wide temperature range. Finally, we suggest important points for increasing the intergrain current.
Koyama Tomio
Machida Masahiko
Ota Yukihiro
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