Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO$_2$
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915783111606272 |
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| author | Gaudet, Jonathan Reig-i-Plessis, Dalmau Wen, Bogeng Hicken, Thomas J. Krieger, Jonas A. Embs, Jan Peter Luetkens, Hubertus Aczel, Adam A. Calder, Stuart A. Stone, Matthew B. Kee, Hae-Young Hallas, Alannah M. |
| author_facet | Gaudet, Jonathan Reig-i-Plessis, Dalmau Wen, Bogeng Hicken, Thomas J. Krieger, Jonas A. Embs, Jan Peter Luetkens, Hubertus Aczel, Adam A. Calder, Stuart A. Stone, Matthew B. Kee, Hae-Young Hallas, Alannah M. |
| contents | We investigate the magnetic ground state of CuNdO$_2$, which is a delafossite with a triangular lattice of magnetic Nd$^{3+}$ 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$^{3+}$ moments. Magnetic susceptibility and heat capacity measurements reveal the onset of long-range antiferromagnetic order at $T_N=0.78$ 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$^{3+}$ moments, which experience extreme frustration on the triangular lattice. Consequently, the frustration in CuNdO$_2$ is relieved through in-plane ordering of the substantially smaller perpendicular component of the Nd$^{3+}$ moments into a 120\textdegree\ structure, with a nearly vanishing ordered moment. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_23523 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO$_2$ Gaudet, Jonathan Reig-i-Plessis, Dalmau Wen, Bogeng Hicken, Thomas J. Krieger, Jonas A. Embs, Jan Peter Luetkens, Hubertus Aczel, Adam A. Calder, Stuart A. Stone, Matthew B. Kee, Hae-Young Hallas, Alannah M. Strongly Correlated Electrons We investigate the magnetic ground state of CuNdO$_2$, which is a delafossite with a triangular lattice of magnetic Nd$^{3+}$ 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$^{3+}$ moments. Magnetic susceptibility and heat capacity measurements reveal the onset of long-range antiferromagnetic order at $T_N=0.78$ 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$^{3+}$ moments, which experience extreme frustration on the triangular lattice. Consequently, the frustration in CuNdO$_2$ is relieved through in-plane ordering of the substantially smaller perpendicular component of the Nd$^{3+}$ moments into a 120\textdegree\ structure, with a nearly vanishing ordered moment. |
| title | Vanishing ordered moment in the frustrated triangular lattice antiferromagnet CuNdO$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2509.23523 |