Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe0.75Ru0.25) 2As2

N. Xu, P. Richard, X. P. Wang, X. Shi, A. Van Roekeghem, T. Qian, E. Ieki, K. Nakayama, T. Sato, E. Rienks, S. Thirupathaiah, J. Xing, H. H. Wen, M. Shi, T. Takahashi, H. Ding

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Abstract

We used high-energy resolution angle-resolved photoemission spectroscopy to extract the momentum dependence of the superconducting gap of Ru-substituted Ba(Fe0.75Ru0.25)2As2 (T c=15 K). Despite a strong out-of-plane warping of the Fermi surface, the magnitude of the superconducting gap observed experimentally is nearly isotropic and independent of the out-of-plane momentum. More precisely, we respectively observed 5.7 and 4.5 meV superconducting gaps on the inner and outer Γ-centered hole Fermi surface pockets, whereas a 4.8 meV gap is recorded on the M-centered electron Fermi surface pockets. Our results are consistent with the J1-J2 model with a dominant antiferromagnetic exchange interaction between the next-nearest Fe neighbors.

Original languageEnglish
Article number094513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number9
DOIs
Publication statusPublished - 2013 Mar 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Xu, N., Richard, P., Wang, X. P., Shi, X., Van Roekeghem, A., Qian, T., Ieki, E., Nakayama, K., Sato, T., Rienks, E., Thirupathaiah, S., Xing, J., Wen, H. H., Shi, M., Takahashi, T., & Ding, H. (2013). Angle-resolved photoemission observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe0.75Ru0.25) 2As2. Physical Review B - Condensed Matter and Materials Physics, 87(9), [094513]. https://doi.org/10.1103/PhysRevB.87.094513