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  • Title: Static and dynamic magnetic properties of the spin-52triangle lattice antiferromagnet Na3Fe(PO4)2studied by31P NMR.
    Author: Ambika DV, Ding QP, Sebastian SJ, Nath R, Furukawa Y.
    Journal: J Phys Condens Matter; 2022 Nov 07; 51(1):. PubMed ID: 36317284.
    Abstract:
    31P nuclear magnetic resonance (NMR) measurements have been carried out to investigate the magnetic properties and spin dynamics of Fe3+(S= 5/2) spins in the two-dimensional triangular lattice (TL) compound Na3Fe(PO4)2. The temperature (T) dependence of nuclear spin-lattice relaxation rates (1/T1) shows a clear peak around Néel temperature,TN=10.9K, corresponding to an antiferromagnetic (AFM) transition. From the temperature dependence of NMR shift (K) aboveTN, an exchange coupling between Fe3+spins was estimated to beJ/kB≃1.9K using the spin-5/2 Heisenberg isotropic-TL model. The temperature dependence of1/T1Tdivided by the magnetic susceptibility (χ),1/T1Tχ, aboveTNproves the AFM nature of spin fluctuations below∼50 Kin the paramagnetic state. In the magnetically ordered state belowTN, the characteristic rectangular shape of the NMR spectra is observed, indicative of a commensurate AFM state in its ground state. The strong temperature dependence of 1/T1in the AFM state is well explained by the two-magnon (Raman) process of the spin waves in a 3D antiferromagnet with a spin-anisotropy energy gap of 5.7 K. The temperature dependence of sublattice magnetization is also well reproduced by the spin waves. Those results indicate that the magnetically ordered state of Na3Fe(PO4)2is a conventional 3D AFM state, and no obvious spin frustration effects were detected in its ground state.
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