Physics – Condensed Matter – Superconductivity
Scientific paper
2009-02-16
Physica C 469 (2009) 507-511
Physics
Condensed Matter
Superconductivity
7 pages, 4 figures, to appear in Physica C, special issue on Fe-pnictides
Scientific paper
10.1016/j.physc.2009.03.037
A brief overview of the superconducting energy gap studies on 122-type family of iron pnictides is given. It seems that the situation in the hole-doped Ba1-xKxFe2As2 is well resolved. Most of the measurements including the presented here point-contact Andreev reflection spectra agree on existence of multiple nodeless gaps in the excitation spectrum of this multiband system. The gaps have basically two sizes - the small one with a strength up to the BCS weak coupling limit and the large one with a very strong coupling with 2Delta/kTc ~ 6 - 8. In the electron doped Ba(Fe1-xCox)2As2 the most of the experiments including our point contact measurements reveal in quite broadened spectra only a single gap with a strong coupling strength. The high precision ARPES measurements on this system identified two gaps but very close to each other, both showing a strong coupling with 2Delta/kTc ~ 5 and 6, respectively.
Bud'ko Sergey L.
Canfield Paul. C.
Pribulova Z.
Pristas G.
Samuely P.
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