Experimental and theoretical electronic structure of EuRh2As2

Authors

• A. D. Palczewski, Iowa State University
• R. S. Dhaka, Iowa State University
• Y. Lee, Iowa State UniversityFollow
• Yogesh Singh, Iowa State University
• D. C. Johnston, Iowa State UniversityFollow
• B. N. Harmon, Iowa State UniversityFollow
• Adam Kaminski, Iowa State UniversityFollow

Date of this Version

2012

Citation

Physical Review B 85, 174509 (2012); DOI: 10.1103/PhysRevB.85.174509

Abstract

The Fermi surfaces (FS’s) and band dispersions of EuRh₂As₂ have been investigated using angle-resolved photoemission spectroscopy. The results in the high-temperature paramagnetic state are in good agreement with the full-potential linearized augmented-plane-wave calculations, especially in the context of the shape of the two-dimensional FS’s and band dispersion around the Γ (0,0) and X (π,π) points. Interesting changes in band folding are predicted by the theoretical calculations below the magnetic transition temperature T_N ≈ 47 K. However, by comparing the FS’s measured at 60 and 40 K, we did not observe any signature of this transition at the Fermi energy, indicating a very weak coupling of the electrons to the ordered magnetic moments or strong fluctuations. Furthermore, the FS does not change across the temperature (≈25 K) where changes are observed in the Hall coefficient. Notably, the Fermi surface deviates drastically from the usual FS of the superconducting iron-based AFe₂As₂ parent compounds, including the absence of nesting between the Γ and X FS pockets.