Multigap Superconductivity in GdFeAsO$_{0.88}$ Evidenced by SnS-Andreev   Spectroscopy
  Using intrinsic multiple Andreev reflection effect (IMARE) spectroscopy we studied superconducting properties of nearly optimal oxygen-deficient GdFeAsO$_{0.88}$ polycrystalline samples (bulk critical temperatures $T_C^{bulk} = 49 \div 52$\,K). Temperature dependences for two superconducting gaps $\Delta_{L,S}(T)$ ($T_C^{local} = 48 \div 50$\,K) have been measured in the range from 4.2 to 50\,K. The $\Delta_{L,S}(T)$ dependences were found to deviate from the BCS-like function; this suggests an importance of the $k$-space (internal) proximity effect between the two condensates. 
T.E. Shanygina, S.A. Kuzmichev, M.G. Mikheev, Ya.G. Ponomarev, S.N.   Tchesnokov, Yu.F. Eltsev, V.M. Pudalov, A.V. Sadakov, ...
cond-mat.supr-con