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Heavy transition metal compounds with strong spin-orbit coupling appeared as a platform for d-electron multipolar physics. We report the electronic, magnetic, and structural properties of antifluorite-type tungsten chloride A2WCl6 (A = Cs, Rb, and K), comprising a face-centered cubic lattice of W4+ ions. The 5d2 configuration of W4+ ions yields a spin-orbit-entangled J = 2 state, which splits into a T2g triplet and a non-Kramers Eg doublet under cubic crystal field. The spin-orbital manifolds have been discussed to give rise to multipolar ordering such as charge quadrupolar or magnetic octupolar ordering. We found that K2WCl6 undergoes a cubic-to-tetragonal structural transition which reconstructs the low-energy J = 2 manifold, leading to a non-magnetic singlet ground state. By contrast, Rb2WCl6 and Cs2WCl6 show no signs of phase transition and remain non-magnetic down to the lowest temperature measured. At low temperatures, signatures of weak structural anomalies were revealed, which may point to the presence of local distortions of the WCl6 octahedra. We argue that the subtle structural distortion arises from the local quadrupolar component, but the presence of chemical disorder likely prevents the formation of long-range multipolar ordering.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: quantum materials, spin-orbit coupling, magnetism, resonant inelastic x-ray scattering, multipolar order

刊行年月日: 2026-10-03

出版者: Springer Science and Business Media LLC

掲載誌:

• npj Quantum Materials (ISSN: 23974648) vol. 11 issue. 1 83

研究助成金:

• Alexander von Humboldt-Stiftung
• Izumi Science and Technology Foundation

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41535-026-00945-w

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更新時刻: 2026-10-05 13:05:05 +0900

MDRでの公開時刻: 2026-10-05 14:21:32 +0900