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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2011, Volume 93, Issue 2, Pages 95–100
(Mi jetpl1813)
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This article is cited in 20 scientific papers (total in 20 papers)
CONDENSED MATTER
Observation of Multi-Gap Superconductivity in GdO(F)FeAs by Andreev Spectroscopy
T. E. Shanyginaab, Ya. G. Ponomarevb, S. A. Kuzmichevb, M. G. Mikheevb, S. N. Tchesnokovb, O. E. Omel'yanovskiiac, A. V. Sadakovac, Yu. F. Eltseva, A. S. Dormidontova, V. M. Pudalovad, A. S. Usoltsevad, E. P. Khlybovec 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
Citation:
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., 93:2 (2011), 95–100; JETP Letters, 93:2 (2011), 94–98
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