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<p>We investigated magnetic moment behaviors of a frustrated antiferromagnet Ba<sub>3</sub>CoSb<sub>2</sub>O<sub>9</sub> using the field-dependent full-multiplet CoO<sub>6</sub> cluster model calculations with physical quantities determined from the Co <i>L</i><sub>2,3</sub>-edge X-ray absorption spectroscopy (XAS) analysis. The XAS analysis shows that the Co 3<i>d</i> spin–orbit coupling is essential to determine the ground state, which becomes Kramer’s doublet states, the so-called <i>J</i><sub>eff</sub> = 1/2 states, split by the spin–orbit coupling from the conventional high spin <i>S</i> = 3/2 <sup>4</sup>T<sub>1</sub> (t<sub>2g</sub><sup>5</sup>e<sub>g</sub><sup>2</sup>) states. The calculation yields a 2.17 <i>μ</i><sub>B</sub> ground state magnetic moment consistent with the reported ~ 1.93 <i>μ</i><sub>B</sub> extrapolated from the high field <i>M</i>–<i>H</i> magnetization curve. Our field-dependent model calculations successfully well reproduce the field-dependent magnetization <i>M</i>(<i>H</i>) in the high field region (&gt; 30&#xa0;T). The spin–orbit coupling turns out to originate an anomalously large van Vleck paramagnetism well explaining the reported susceptibility.</p>

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Anomalous van Vleck paramagnetism induced by the spin–orbit coupling in Ba3CoSb2O9

  • 期刊论文

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  • 发表日期：

    2025年12月30日

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  • Jong-Hyeok Choi,
  • Choong-Jae Won,
  • Woo-Suk Noh,
  • Seung-Hwan Do,
  • Jae-Hoon Park

摘要

We investigated magnetic moment behaviors of a frustrated antiferromagnet Ba3CoSb2O9 using the field-dependent full-multiplet CoO6 cluster model calculations with physical quantities determined from the Co L2,3-edge X-ray absorption spectroscopy (XAS) analysis. The XAS analysis shows that the Co 3d spin–orbit coupling is essential to determine the ground state, which becomes Kramer’s doublet states, the so-called Jeff = 1/2 states, split by the spin–orbit coupling from the conventional high spin S = 3/2 4T1 (t2g5eg2) states. The calculation yields a 2.17 μB ground state magnetic moment consistent with the reported ~ 1.93 μB extrapolated from the high field M–H magnetization curve. Our field-dependent model calculations successfully well reproduce the field-dependent magnetization M(H) in the high field region (> 30 T). The spin–orbit coupling turns out to originate an anomalously large van Vleck paramagnetism well explaining the reported susceptibility.