TY  - JOUR
AU  - Hayashida, S.
AU  - Gretarsson, H.
AU  - Puphal, P.
AU  - Isobe, M.
AU  - Goering, E.
AU  - Matsumoto, Y.
AU  - Nuss, J.
AU  - Takagi, H.
AU  - Hepting, M.
AU  - Keimer, Bernhard
TI  - Magnetic ground state of the dimer-based hexagonal perovskite Ba<sub>3</sub>ZnRu<sub>2</sub>O<sub>9</sub>
JO  - Physical review / B
VL  - 111
IS  - 10
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - PUBDB-2025-01051
SP  - 104418
PY  - 2025
AB  - 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. 
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001456982700003
DO  - DOI:10.1103/PhysRevB.111.104418
UR  - https://bib-pubdb1.desy.de/record/625203
ER  -