Ru L3-edge X-ray absorption near-edge structure (XANES) and magnetic studies for Ca2RuO4 antiferromagnetic insulator, Sr2RuO4 p-wave superconductor, CaRuO3 exchange-enchange-enhanced paramagnetic metal, SrRuO3 itinerant ferromagnetic metal and BaRuO3 paramagnetic metal are compared. Although these compounds crystallized with different structural distortions, they possess similar RuO6 octahedral environment where the Ru 4d orbitals are split into partially filled t2g bands with four electrons and empty eg bands. Two 2p3/2-4d dipole transition peaks are observed with lower energy peak A for transition to unfilled t2g states and the higher energy peak B to empty eg states. The L3-edge absorption intensity, shape and eg-t2g average band separation ΔE (B-A) is closely related to the variation of RuO6 distortion, Ru-O d-p hybridization and unfilled Ru 4d band width.
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Materials Science(all)
- Condensed Matter Physics