Point-contact Andreev reflection studies of the superconducting energy gap on the NdFeAsOF, (Ba,K)Fe$_{2}$As$_{2}$ and Ba(Fe,Co)$_{2}$As$_{2}$ crystals will be presented. The analysis of the data points to a two-gap superconductivity in these materials. Possible existence of the pseudogap in the non-superconducting density of states related to the static or dynamic magnetic order will be discussed as well.
*This work has been supported by the Slovak Research and Development Agency under the contract Nos. APVT-0346-07, VVCE-0058-07. CLTP is operated as the Centre of Excellence of the Slovak Academy of Sciences.
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Authors
Peter Samuely
Centre of Low Temperature Physics Kosice
Pavol Szabo
Centre of Low Temperature Physics Kosice
Zuzana Pribulova
Centre of Low Temperature Physics Kosice
Gabriel Pristas
Centre of Low Temperature Physics Kosice
P.C. Canfield
Ames Laboratory and Department of Physics and Astronomy, Iowa State Univeristy, Ames, Iowa 50011
Ames Laboratory and Iowa State University
Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA
Ames Laboratory
Ames Laboratory, US DOE and Iowa State University
Ames Laboratory/Department of Physics and Astronomy
Ames Lab / Iowa State University
Ames Laboratory/Iowa State University
S.L. Bud'ko
Ames Laboratory and Iowa State University
Ames Laboratory and Physics Department and Astronomy, Iowa State University, Ames, IA
Ames Laboratory
Ames Laboratory, US DOE and Iowa State University
Ames Laboratory/Iowa State University
Ames Laboratory/Department of Physics and Astronomy
