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| Home > Publications database > Spin structures and phase diagrams of the spin- 5 2 triangular lattice antiferromagnet Na 2 BaMn ( PO 4 ) 2 under magnetic field |
| Journal Article | FZJ-2025-04639 |
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2025
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/kszh-m6bf doi:10.34734/FZJ-2025-04639
Abstract: We combine single-crystal neutron diffraction studies and Monte Carlo simulations to determine the spin structures and finite-temperature phase diagram of the spin-5/2 triangular-lattice antiferromagnet Na2BaMn(PO4)2 in magnetic field. With the application of a magnetic field in two different directions, namely along the 𝑐 axis and in the 𝑎𝑏 plane of the trigonal symmetry, we track the evolution of the spin structure through changes of the magnetic propagation vector. We account for these results with a minimal Heisenberg Hamiltonian that includes easy-axis anisotropy and weak, frustrated interlayer couplings in addition to intralayer exchange. Guided by representation analysis, we refine symmetry-allowed modes to the measured intensities and obtain the spin structures for all field-induced phases, which we compare quantitatively with simulated configurations. Taken together, our measurements and simulations show that frustrated interlayer exchange—rather than purely two-dimensional physics—organizes the unexpectedly rich field-induced phases of Na2BaMn(PO4)2.
Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)
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