Evidence of a multiple boson emission in Sm$_{1-x}$Th$_x$OFeAs
S.A. Kuzmichev, T.E. Kuzmicheva, N.D. Zhigadlo

TL;DR
This study identifies a multiple boson emission feature in the conductance spectra of Sm$_{1-x}$Th$_x$OFeAs superconductors, linking it to the superconducting gaps and critical temperature, suggesting a connection to spin resonance modes.
Contribution
First observation of a multiple boson emission signature in the conductance spectra of Sm$_{1-x}$Th$_x$OFeAs superconductors, correlating bosonic mode energy with superconducting gaps and critical temperature.
Findings
Bosonic mode energy reaches ~14.8 meV at optimal doping.
Bosonic energy and superconducting gaps scale with critical temperature.
The energy ratio suggests a connection to spin resonance modes.
Abstract
We studied a reproducible fine structure observed in dynamic conductance spectra of Andreev arrays in SmThOFeAs superconductors with various thorium concentrations () and critical temperatures \,K. 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 \,meV for optimal compound. Within the studied range of , this energy as well as the large and the small superconducting gaps, nearly scales with critical temperature with the characteristic ratio (and , correspondingly) resembling the expected energy of spin resonance and spectral density enhancement in …
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