Volume 119, Number 1, July 2017
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||14 September 2017|
Evidence of a multiple boson emission in Sm1−xThxOFeAs
1 Department of Low Temperature Physics and Superconductivity, M.V. Lomonosov Moscow State University 119991 Moscow, Russia
2 Laboratory of Strongly Correlated Electron Systems, P.N. Lebedev Physical Institute, Russian Academy of Sciences 119991 Moscow, Russia
3 Department of Chemistry and Biochemistry, University of Bern - Freiestrasse 3, CH-3012 Bern, Switzerland
Received: 1 June 2017
Accepted: 25 August 2017
We studied a reproducible fine structure observed in dynamic conductance spectra of Andreev arrays in Sm1−xThxOFeAs superconductors with various thorium concentrations and critical temperatures . This structure is unambiguously caused by a multiple boson emission (of the same energy) during the process of multiple Andreev reflections. The directly determined energy of the bosonic mode reaches for optimal compounds. Within the studied range of Tc, this energy as well as the large and the small superconducting gaps, nearly scale with critical temperature with the characteristic ratio (and , respectively) resembling the expected energy of spin resonance and spectral density enhancement in and states, respectively.
PACS: 74.25.-q – Properties of superconductors / 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 74.70.Xa – Pnictides and chalcogenides
© EPLA, 2017
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