Local quasiparticle density of states of superconducting SmFeAsO$1-x$F$x$ single crystals: Evidence for spin-mediated pairing

Abstract

We probe the local quasiparticles density-of-states in micron-sized SmFeAsO${}_{1-x}$F${}_x$ single-crystals by means of Scanning Tunnelling Spectroscopy. Spectral features resemble those of cuprates, particularly a dip-hump-like structure developed at energies larger than the gap that can be ascribed to the coupling of quasiparticles to a collective mode, quite likely a resonant spin mode. The energy of the collective mode revealed in our study decreases when the pairing strength increases. Our findings support spin-fluctuation-mediated pairing in pnictides.

11 pages, 4 figures

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• Detection of bosonic mode as a signature of magnetic excitation in one unit cell FeSe on SrTiO3
• Strong-Coupling Superconductivity in NaFe${}_{1-x}$Co${}_x$As: the Eliashberg Theory and Beyond
• Evolution of Superconducting Gaps in Th-Substituted Sm${}_{1-x}$Th${}_x$OFeAs Studied by Multiple Andreev Reflection Spectroscopy
• Strong-coupling analysis of scanning tunneling spectra in Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$
• Tracing the electronic pairing glue in unconventional superconductors via inelastic Scanning Tunneling Spectroscopy
• Pairing insights in iron-based superconductors from scanning tunneling microscopy
• Point-contact study of ReFeAs(1-x)Fx (Re=La, Sm) superconducting films
• Unprecedentedly large gap in HgBa${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$ with the highest $T_c$ at ambient pressure
• Strong surface termination dependence of the electronic structure of polar superconductor LaFeAsO revealed by nano-ARPES
• Evidence of a multiple boson emission in Sm${}_{1-x}$Th${}_x$OFeAs
• Calculation of the effect of random superfluid density on the temperature dependence of the penetration depth
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• Unconventional superconductivity in the strong-coupling limit for the heavy fermion system CeCoIn${}_5$
• Effects of order parameter self-consistency in a $s_{\pm }$-s junction
• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals