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arxiv: 1012.4440 · v2 · pith:SXOA7DATnew · submitted 2010-12-20 · ❄️ cond-mat.supr-con

Observation of Multi-Gap Superconductivity in GdO(F)FeAs by Andreev Spectroscopy

T.E. Shanygina , Ya.G. Ponomarev , S.A. Kuzmichev , M.G. Mikheev , S.N. Tchesnokov , O.E. Omel'yanovskii , A.V. Sadakov , Yu.F. Eltsev
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A.S. Dormidontov V.M. Pudalov A.S. Usol'tsev E.P. Khlybov
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classification ❄️ cond-mat.supr-con
keywords andreevdeltafeasmulti-gapsuperconductivityapproachbreak-junctionbulk
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We have studied current-voltage characteristics of Andreev contacts in polycrystalline GdO$_{0.88}$F$_{0.12}$FeAs samples with bulk critical temperature ${T_c}$ = (52.5 \pm 1)K using break-junction technique. The data obtained cannot be described within the single-gap approach and suggests the existence of a multi-gap superconductivity in this compound. The large and small superconducting gap values estimated at T = 4.2K are {\Delta}L = 10.5 \pm 2 meV and {\Delta}S = 2.3 \pm 0.4 meV, respectively.

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