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Giorgio, C. Di; Putilov, A. V.; Trainer, D. J.; Volkova, O. S.; Vasiliev, A. N.; Chareev, D.; Karapetrov, G.; Zasadzinski, J. F.; Iavarone, M.
Journal of superconductivity and novel magnetism, 08/2016, Letnik: 30, Številka: 3Journal Article
Scanning tunneling spectroscopy has been used to investigate the superconducting gaps of FeSe1–x Sx single crystals and to reveal signatures of a bosonic mode in the quasiparticle density of states. We find that both superconducting gaps residing on different pockets of the Fermi surface are anisotropic. Moreover, the bosonic mode appears in the quasiparticle density of states as a redistribution of states at energy Ω/e, measured with respect to the superconducting gap. The energy of the boson mode Ω is found to scale with the superconducting gap and it can be estimated to be in the range 2.6 ÷ 3.8 meV in agreement with a recent observation of a resonance spin excitation in neutron scattering. Furthermore, this suggests that quasiparticle interaction with this mode are important for superconductivity.
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