Article Spin-singlet ground state with spin gap in S eff = 1 2 antiferromagnetic tetramer compound Yb 2 SiO 5

Masashi Hase SAMURAI ORCID (National Institute for Materials Science) ; Koji Kaneko ; Chihiro Tabata ; Hiroki Yamauchi ; Naohito Tsujii SAMURAI ORCID (National Institute for Materials Science) ; Andreas Dönni SAMURAI ORCID (National Institute for Materials Science)

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Masashi Hase, Koji Kaneko, Chihiro Tabata, Hiroki Yamauchi, Naohito Tsujii, Andreas Dönni. Spin-singlet ground state with spin gap in S eff = 1 2 antiferromagnetic tetramer compound Yb 2 SiO 5 . Physical Review B. 2025, 111 (9), 094403. https://doi.org/10.1103/physrevb.111.094403

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(abstract)

We studied the magnetic properties of Yb2SiO5 with pseudospins of Seff = 1/2 using magnetic
susceptibility, specific heat, and inelastic neutron scattering (INS) measurements. A broad maximum
appears at Tmax ∼ 6 K in the plot of the magnetic susceptibility [χ(T)] as a function of
temperature (T), indicating a low-dimensional antiferromagnetic (AFM) spin system. The susceptibility
decreases rapidly with decreasing T below Tmax, suggesting a spin-singlet ground state
with a spin gap. We observed cluster-like excitations for energy transfers of ω ∼ 0.7, 1.2, and 1.9
meV in the INS measurements. The T dependence of the intensity [I(T)] indicates that the three
excitations are magnetic ones. We determined that the spin system in Yb2SiO5 is the Seff = 1/2
AFM tetramer with two exchange interactions of J1 = 0.74 meV and J2 = 0.95 meV. The spin
tetramer can explain the excitation energies, χ(T), magnetic specific heat at T < 15 K, and the
magnitude of the scattering vector (Q) dependence of the intensity [I(Q)] at 0.7 and 1.2 meV.
The spin tetramer, however, cannot well explain the I(Q) at 1.9 meV and the I(T) of the three
excitations, likely because of the effects of weak inter-tetramer interactions.

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Keyword: spin-singlet ground state, spin gap, antiferromagnetic tetramer, Yb2SiO5, inelastic neutron scattering

Date published: 2025-03-03

Publisher: American Physical Society (APS)

Journal:

  • Physical Review B (ISSN: 1550235X) vol. 111 issue. 9 094403

Funding:

  • Japan Society for the Promotion of Science 24K06947
  • Japan Society for the Promotion of Science 24K00590
  • Ministry of Education, Culture, Sports, Science and Technology

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5398

First published URL: https://doi.org/10.1103/physrevb.111.094403

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Updated at: 2025-04-02 16:30:21 +0900

Published on MDR: 2025-04-02 17:21:15 +0900

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