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.