S. A. Kuzmichev, T. E. Kuzmicheva, “Observation of bosonic resonances in GdO$_{1-x}$F$_x$FeAs by intrinsic multiple Andreev reflection effect spectroscopy”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2017, Volume 105, Issue 10,Pages 631

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Observation of bosonic resonances in GdO$_{1-x}$F$_x$FeAs by intrinsic multiple Andreev reflection effect spectroscopy

S. A. Kuzmichev^ab, T. E. Kuzmicheva^b

^a Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
^b Moscow State University, Moscow, Russia

Abstract: The current-voltage characteristics and dynamic conductance spectra of Andreev arrays in nearly optimal GdO$_{1-x}$F$_x$FeAs superconductors with the critical temperature $T_{\text{c}}=46{-}50$ K have been studied. A reproducible fine structure that accompanies large gap features and caused by boson emission during the process of multiple Andreev reflections has been observed. At $T=4.2$ K, the bosonic mode energy $\varepsilon_0 = (12 \pm 2)$ meV has been obtained.

Received: 21.03.2017
Revised: 20.04.2017

DOI: 10.7868/S0370274X17100113