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| मुख्य लेखकों: | , , , , , |
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| स्वरूप: | Preprint |
| प्रकाशित: |
2025
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| विषय: | |
| ऑनलाइन पहुंच: | https://arxiv.org/abs/2507.01403 |
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| _version_ | 1866916821324529664 |
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| author | Chikara, K. S. Bera, A. K. Kumar, A. Yusuf, S. M. Orlandi, F. Balz, C. |
| author_facet | Chikara, K. S. Bera, A. K. Kumar, A. Yusuf, S. M. Orlandi, F. Balz, C. |
| contents | We report the magnetic ground state, spin excitations, and spin Hamiltonian of the 2D spin-1 trimerized Heisenberg antiferromagnet Li2Ni3P4O14. Below the magnetic ordering temperature TN = 14.5 K, the compound exhibits a canted long-range antiferromagnetic order with a propagation vector k = (0 0 0), consistent with the magnetic space group P21/c.1 (No. 14.75). The ground state magnetic structure consists of ferromagnetic spin-trimers of Ni2+ ions. The spin-trimers are coupled antiferromagnetically along the c-axis and ferromagnetically along the a-axis. Inelastic neutron scattering (INS) reveals gapped and dispersive magnon excitations below the TN, and gapless quasi-elastic scatterings at higher temperature. The linear spin-wave theory simulations reveal the essential features of the excitation spectrum; by a spin Hamiltonian composed of ferromagnetic intra-trimer exchange interaction J1 and inter-trimer exchange interactions J2 (FM) and J3(AFM) within the bc plane. The J2 and J3 along the b-axis and c-axis, respectively, with strengths of J2/J1=0.79 and J3/J1=-0.91. In addition, a weak inter planer ferromagnetic exchange interaction J4 (|J4/J1|~0.12) is found along the a-axis. The determined exchange constants reveal a 2D trimerized Collinear-II spin lattice within the bc-plane. The analysis of INS spectra by linear spin-wave theory also yields a moderate single-ion anisotropy (D/J1=0.48) which accounts for the observed spin gap below TN as well as the metamagnetic transition near 44 kOe in dc magnetization (M vs H) curves. These findings identify Li2Ni3P4O14 as a rare realization of a two-dimensional trimerized spin system and offer the direct experimental confirmation of theoretically predicted magnon excitations, unveiling the fundamental characteristics of the expected excitation spectrum. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_01403 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic Ground State and Spin Excitations in the 2D Trimerized Collinear-II Lattice Antiferromagnet Li2Ni3P4O14 Chikara, K. S. Bera, A. K. Kumar, A. Yusuf, S. M. Orlandi, F. Balz, C. Strongly Correlated Electrons Materials Science We report the magnetic ground state, spin excitations, and spin Hamiltonian of the 2D spin-1 trimerized Heisenberg antiferromagnet Li2Ni3P4O14. Below the magnetic ordering temperature TN = 14.5 K, the compound exhibits a canted long-range antiferromagnetic order with a propagation vector k = (0 0 0), consistent with the magnetic space group P21/c.1 (No. 14.75). The ground state magnetic structure consists of ferromagnetic spin-trimers of Ni2+ ions. The spin-trimers are coupled antiferromagnetically along the c-axis and ferromagnetically along the a-axis. Inelastic neutron scattering (INS) reveals gapped and dispersive magnon excitations below the TN, and gapless quasi-elastic scatterings at higher temperature. The linear spin-wave theory simulations reveal the essential features of the excitation spectrum; by a spin Hamiltonian composed of ferromagnetic intra-trimer exchange interaction J1 and inter-trimer exchange interactions J2 (FM) and J3(AFM) within the bc plane. The J2 and J3 along the b-axis and c-axis, respectively, with strengths of J2/J1=0.79 and J3/J1=-0.91. In addition, a weak inter planer ferromagnetic exchange interaction J4 (|J4/J1|~0.12) is found along the a-axis. The determined exchange constants reveal a 2D trimerized Collinear-II spin lattice within the bc-plane. The analysis of INS spectra by linear spin-wave theory also yields a moderate single-ion anisotropy (D/J1=0.48) which accounts for the observed spin gap below TN as well as the metamagnetic transition near 44 kOe in dc magnetization (M vs H) curves. These findings identify Li2Ni3P4O14 as a rare realization of a two-dimensional trimerized spin system and offer the direct experimental confirmation of theoretically predicted magnon excitations, unveiling the fundamental characteristics of the expected excitation spectrum. |
| title | Magnetic Ground State and Spin Excitations in the 2D Trimerized Collinear-II Lattice Antiferromagnet Li2Ni3P4O14 |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2507.01403 |