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Observation of multi-gap superconductivity in GdO(F)FeAs by Andreev spectroscopy |
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| Authors: | 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 A S Dormidontov V M Pudalov A S Usol’tsev E P Khlybov |
| Institution: | 1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia 2. Department of Low Temperature Physics and Superconductivity, Moscow State University, Moscow, 119991, Russia 3. International Laboratory of High Magnetic Fields and Low Temperatures, 53-421, Wroclaw, Poland 4. Moscow Institute of Physics and Technology, Moscow, 141700, Russia 5. Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russia |
| Abstract: | We have studied current-voltage characteristics of Andreev contacts in polycrystalline GdO0.88F0.12FeAs samples with bulk critical temperature T c = (52.5 ± 1) K using break-junction technique. The data obtained can- not 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 = 4.2 K are Δ L = 10.5 ± 2 meV and Δ s = 2.3 ± 0.4 meV, respectively. |
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