We focus on effects of nonmagnetic impurities on the superconducting transition temperatures Tc and point out, using various experimental evidences obtained for LnFe1-y MyAsO 0.89-xF0.11+x (Ln=La and Nd; M=Co, Ni, Mn, Ru) systems, that the sign reversal of the order parameters Δ pointed out theoretically at the early stage of the study does not exist between disconnected Fermi surfaces around Γ and M points. The results imply that a new pairing mechanism different from the spin-fluctuation exchange and possibly related to the orbital degrees of freedom, should be considered seriously.
|Journal||Journal of Physics: Conference Series|
|Issue number||PART 2|
|Publication status||Published - 2012|
|Event||26th International Conference on Low Temperature Physics, LT 2011 - Beijing, China|
Duration: 2011 Aug 10 → 2011 Aug 17
ASJC Scopus subject areas
- Physics and Astronomy(all)