Journal article
Anisotropic Superconducting Gaps and Boson Mode in FeSe1–x Sx Single Crystals
Journal of superconductivity and novel magnetism, Vol.30(3)
20 Aug 2016
Abstract
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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Details
- Title
- Anisotropic Superconducting Gaps and Boson Mode in FeSe1–x Sx Single Crystals
- Creators
- C. Di Giorgio - Temple Univ., Philadelphia, PA (United States)A. V. Putilov - Temple Univ., Philadelphia, PA (United States)D. J. Trainer - Temple Univ., Philadelphia, PA (United States)O. S. VolkovaA. N. VasilievD. ChareevG. Karapetrov - Drexel UniversityJ. F. Zasadzinski - Illinois Institute of Technology, Chicago, IL (United States)M. Iavarone - Temple UniversityTemple Univ., Philadelphia, PA (United States)
- Publication Details
- Journal of superconductivity and novel magnetism, Vol.30(3)
- Publisher
- Springer
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991019295310704721