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. Usoltsev, E. P. Khlybov, “Observation of Multi-Gap Superconductivity in GdO(F)FeAs by Andreev Spectroscopy”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2011, Volume 93, Issue 2,Pages <nobr>95

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

T. E. Shanygina^ab, Ya. G. Ponomarev^b, S. A. Kuzmichev^b, M. G. Mikheev^b, S. N. Tchesnokov^b, O. E. Omel'yanovskii^ac, A. V. Sadakov^ac, Yu. F. Eltsev^a, A. S. Dormidontov^a, V. M. Pudalov^ad, A. S. Usoltsev^ad, E. P. Khlybov^ec

^a P. N. Lebedev Physical Institute RAS, 119991 Moscow, Russia
^b Department of Low Temperature Physics and Superconductivity, Moscow State University, 119991 Moscow, Russia
^c International Laboratory of High Magnetic Fields and Low Temperatures, 53-421 Wroclaw, Poland
^d Moscow Institute of Physics and Technology, 141700 Moscow, Russia
^e Institute for High Pressure Physics RAS, 142190 Troitsk, Moscow district, Russia

Abstract: 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 $T = 4.2$ K are $\Delta_L=10.5\pm 2$ meV and $\Delta_S$ = $2.3 \pm 0.4$ meV, respectively.

Received: 09.12.2010

Language: English