Observation of bosonic resonances in GdO1−x F x FeAs by intrinsic multiple Andreev reflection effect spectroscopy

The current–voltage characteristics and dynamic conductance spectra of Andreev arrays in nearly optimal GdO1 − xFxFeAs superconductors with the critical temperature Tc = 46–50 K have been studied. A reproducible fine structure that accompanies large gap features and caused by boson emission during t...

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Bibliographic Details
Published in:JETP letters 2017-05, Vol.105 (10), p.671-676
Main Authors: Kuzmichev, S. A., Kuzmicheva, T. E.
Format: Article
Language:English
Subjects:
Critical temperature
Current voltage characteristics
Emission spectroscopy
Fine structure
Resistance
Spectrum analysis
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Summary:The current–voltage characteristics and dynamic conductance spectra of Andreev arrays in nearly optimal GdO1 − xFxFeAs superconductors with the critical temperature Tc = 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 ε0 = (12 ± 2) meV has been obtained.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364017100083