%0 Journal Article
%A Biniskos, Nikolaos
%A Santos, F. J. dos
%A Stekiel, M.
%A Schmalzl, K.
%A Ressouche, E.
%A Sviták, D.
%A Labh, A.
%A Vališka, M.
%A Marzari, N.
%A Čermák, P.
%T Spin structures and phase diagrams of the spin- 5 2 triangular lattice antiferromagnet Na 2 BaMn ( PO 4 ) 2 under magnetic field
%J Physical review / B
%V 112
%N 17
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2025-04639
%P 174429
%D 2025
%X 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 Na2⁢BaMn⁢(PO4)2 in magnetic field. With the application of a magnetic field in two different directions, namely along the 𝑐 axis and in the 𝑎⁢𝑏 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 Na2⁢BaMn⁢(PO4)2.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/kszh-m6bf
%U https://juser.fz-juelich.de/record/1048433