Static and dynamic magnetic properties of the spiin-$\frac{5}{2}$triangle lattice antiferromagnet Na3Fe(PO4)2 studied by 31P NMR

Ambika, Devi V.; Ding, Qing-Ping; Sebastian, Sebin J.; Nath, Ramesh; Furukawa, Yuji

doi:10.1088/1361-648x/ac9e37

Static and dynamic magnetic properties of the spiin-$$\frac{5}{2}$$triangle lattice antiferromagnet Na₃Fe(PO₄)₂ studied by ³¹P NMR

Journal Article · Sun Nov 06 23:00:00 EST 2022 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/1361-648x/ac9e37· OSTI ID:1899318

^[1]; Ding, Qing-Ping ^[1]; ^[2]; ^[2]; ^[1]

Ames Laboratory, and Iowa State University, Ames, IA (United States)
Indian Institute of Science and Education Research, Thiruvananthapuram (India)

We report 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, T_N = 10.9 K, corresponding to an antiferromagnetic (AFM) transition. From the temperature dependence of NMR shift (K) above T_N, an exchange coupling between Fe³⁺ spins was estimated to be J/k_B ≃ 1.9 K using the spin-5/2 Heisenberg isotropic-TL model. The temperature dependence of 1/T₁T divided by the magnetic susceptibility (χ), 1/T₁T_χ, above T_N proves the AFM nature of spin fluctuations below ~50 K in the paramagnetic state. In the magnetically ordered state below T_N, 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/T₁ in 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)₂ is a conventional 3D AFM state, and no obvious spin frustration effects were detected in its ground state

View Accepted Manuscript (DOE)

Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; SERB (India); Government of India

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1899318

Report Number(s):: IS-J-10,942

Journal Information:: Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 1 Vol. 51; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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