%0 Journal Article
%A Hayashida, S.
%A Gretarsson, H.
%A Puphal, P.
%A Isobe, M.
%A Goering, E.
%A Matsumoto, Y.
%A Nuss, J.
%A Takagi, H.
%A Hepting, M.
%A Keimer, Bernhard
%T Magnetic ground state of the dimer-based hexagonal perovskite Ba<sub>3</sub>ZnRu<sub>2</sub>O<sub>9</sub>
%J Physical review / B
%V 111
%N 10
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M PUBDB-2025-01051
%P 104418
%D 2025
%X We investigate the magnetic ground state of single crystals of the ruthenium-dimer-based hexagonal perovskite Ba<sub>3</sub>⁢ZnRu<sub>2</sub>⁢O<sub>9</sub> using magnetic susceptibility and resonant inelastic x-ray scattering (RIXS) measurements. While a previous study on powder samples exhibited intriguing magnetic behavior, questions about whether the spin state within a Ru<sub>2</sub>⁢O<sub>9</sub> dimer is a conventional 𝑆=3/2 dimer or an orbital-selective 𝑆=1 dimer were raised. The RIXS spectra reveal magnetic excitations from Hund's intraionic multiplet and intradimer spin-triplet transitions. The observed transition energies of the Hund's intraionic multiplets align with the 𝑆=3/2 ground state, contrasting with the theoretically proposed orbital-selective 𝑆=1 dimer state. High-temperature magnetic susceptibility analysis confirms the realization of the spin 𝑆=3/2 dimer state, and the extracted intradimer coupling is consistent with the spin-triplet transition energy observed in the RIXS spectra. These results highlights the ability of “spectroscopic fingerprinting” by RIXS to determine the magnetic ground states of complex materials. 
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:001456982700003
%R 10.1103/PhysRevB.111.104418
%U https://bib-pubdb1.desy.de/record/625203