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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.

権利情報:

• In Copyright
  

  ©2025 American Physical Society

キーワード: spin-singlet ground state, spin gap, antiferromagnetic tetramer, Yb2SiO5, inelastic neutron scattering

刊行年月日: 2025-03-03

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

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

原稿種別: 著者最終稿 (Accepted manuscript)

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

公開URL: https://doi.org/10.1103/physrevb.111.094403

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更新時刻: 2025-04-02 16:30:21 +0900

MDRでの公開時刻: 2025-04-02 17:21:15 +0900