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ARPES observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe$_{0.75}$Ru$_{0.25}$)$_2$As$_2$
- Source :
- Physical Review B 87, 094513 (2013)
- Publication Year :
- 2012
-
Abstract
- We used high-energy resolution angle-resolved photoemission spectroscopy to extract the momentum dependence of the superconducting gap of Ru-substituted Ba(Fe$_{0.75}$Ru$_{0.25}$)$_2$As$_2$ ($T_c = 15$ 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 meV and 4.5 meV superconducting gaps on the inner and outer $\Gamma$-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 $J_1-J_2$ model with a dominant antiferromagnetic exchange interaction between the next-nearest Fe neighbors.<br />Comment: 5 pages, 4 figures
Details
- Database :
- arXiv
- Journal :
- Physical Review B 87, 094513 (2013)
- Publication Type :
- Report
- Accession number :
- edsarx.1211.2080
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.87.094513