ARPESによるEuRhSiの反強磁性転移の観測

Observation of antiferromagnetic transition of EuRhSi by ARPES

藤森 伸一   ; 山上 浩志; Gttler, M.*; Vyalikh, D. V.*; Laubschat, C.*; Seiro, C.*; Geibel, C.*

Fujimori, Shinichi; Yamagami, Hiroshi; Gttler, M.*; Vyalikh, D. V.*; Laubschat, C.*; Seiro, C.*; Geibel, C.*

The electronic structure of EuRhSi was studied by angle resolved photoelectron spectroscopy (ARPES) with soft X-ray ( eV). EuRhSi is a divalent Eu-based compound which exhibits an antiferromagnetic transition at K. The spectra consist of Eu 4f multiplet structure in the energy region of eV, and dispersive bands originated from ligand states. The Eu 4f multiplets exhibit energy dispersions, suggesting they have a hybridization with the ligand states. Temperature dependence of ARPES spectra was clearly observed in the Eu 4f multiplet structure particularly around the point, which is caused by the folding of the Brillouin zone due to the antiferromagnetic transition. We discuss the nature of the antifferomagnetic transition in EuRhSi in terms of its band structure and Fermi surface.