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<p>We investigate the magnetic ground state of CuNdO<sub>2</sub>, which is a delafossite with a triangular lattice of magnetic Nd<sup>3+</sup> ions that are well separated by non-magnetic Cu spacer layers. From inelastic neutron scattering measurements of the crystal electric field, we determine the strong Ising character of the pseudo-spin 1/2 Nd<sup>3+</sup> moments. Magnetic susceptibility and heat capacity measurements reveal the onset of long-range antiferromagnetic order at <i>T</i><sub><i>N</i></sub> = 0.78 K. While the magnetic transition is definitively observed with muon spin relaxation, accompanied by the formation of a weakly dispersing spin wave excitation, no dipole-ordered moment is detected with neutron diffraction. We show that the apparent absence of a dipolar ordered moment is a consequence of the dominant Ising character of the antiferromagnetically coupled Nd<sup>3+</sup> moments, which experience extreme frustration on the triangular lattice. Consequently, the frustration in CuNdO<sub>2</sub> is relieved through in-plane ordering of the substantially smaller perpendicular component of the Nd<sup>3+</sup> moments into a 120° structure, with a nearly vanishing ordered moment.</p>

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Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO2

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月11日

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  • Jonathan Gaudet,
  • Dalmau Reig-i-Plessis,
  • Bogeng Wen,
  • Thomas J. Hicken,
  • Jonas A. Krieger,
  • Jan Peter Embs,
  • Hubertus Luetkens,
  • Adam A. Aczel,
  • Stuart A. Calder,
  • Matthew B. Stone,
  • Hae-Young Kee,
  • Alannah M. Hallas

摘要

We investigate the magnetic ground state of CuNdO2, which is a delafossite with a triangular lattice of magnetic Nd3+ ions that are well separated by non-magnetic Cu spacer layers. From inelastic neutron scattering measurements of the crystal electric field, we determine the strong Ising character of the pseudo-spin 1/2 Nd3+ moments. Magnetic susceptibility and heat capacity measurements reveal the onset of long-range antiferromagnetic order at TN = 0.78 K. While the magnetic transition is definitively observed with muon spin relaxation, accompanied by the formation of a weakly dispersing spin wave excitation, no dipole-ordered moment is detected with neutron diffraction. We show that the apparent absence of a dipolar ordered moment is a consequence of the dominant Ising character of the antiferromagnetically coupled Nd3+ moments, which experience extreme frustration on the triangular lattice. Consequently, the frustration in CuNdO2 is relieved through in-plane ordering of the substantially smaller perpendicular component of the Nd3+ moments into a 120° structure, with a nearly vanishing ordered moment.