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24 April 2024

» arxiv » 1008.2019

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Local quasiparticle density of states of superconducting SmFeAsO$1-x$F$x$ single crystals: Evidence for spin-mediated pairing
Y. Fasano ; I. Maggio-Aprile ; N.D. Zhigadlo ; S. Katrych ; J. Karpinski ; Ø. Fischer ;
Date:	11 Aug 2010
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.
Source:	arXiv, 1008.2019
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