Magnetic ground state of the dimer-based hexagonal perovskite Ba3ZnRu2O9

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy Physical Review B Pub Date : 2025-03-13 DOI:10.1103/physrevb.111.104418

S. Hayashida, H. Gretarsson, P. Puphal, M. Isobe, E. Goering, Y. Matsumoto, J. Nuss, H. Takagi, M. Hepting, B. Keimer

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Abstract

We investigate the magnetic ground state of single crystals of the ruthenium-dimer-based hexagonal perovskite Ba3ZnRu2O9 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 Ru2O9 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.

Published by the American Physical Society

2025

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二聚体基六方钙钛矿Ba3ZnRu2O9的磁基态

利用磁化率和共振非弹性x射线散射（RIXS）测量研究了钌二聚体基六方钙钛矿Ba3ZnRu2O9单晶的磁基态。虽然先前对粉末样品的研究显示出有趣的磁性行为，但关于Ru2O9二聚体内的自旋状态是传统的S=3/2二聚体还是轨道选择性S=1二聚体的问题提出了。RIXS光谱揭示了Hund的电子内多重态和内部自旋三重态跃迁的磁激发。观察到的洪德的电子内多重态的跃迁能量与S=3/2基态一致，与理论上提出的轨道选择性S=1二聚体态形成对比。高温磁化率分析证实了自旋S=3/2二聚体态的实现，提取的内旋耦合与RIXS光谱中观测到的自旋三重态跃迁能一致。这些结果突出了RIXS的“光谱指纹”技术在确定复杂材料的磁性基态方面的能力。2025年由美国物理学会出版

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

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