TY  - JOUR
AU  - Biniskos, Nikolaos
AU  - Santos, F. J. dos
AU  - Stekiel, M.
AU  - Schmalzl, K.
AU  - Ressouche, E.
AU  - Sviták, D.
AU  - Labh, A.
AU  - Vališka, M.
AU  - Marzari, N.
AU  - Čermák, P.
TI  - Spin structures and phase diagrams of the spin- 5 2 triangular lattice antiferromagnet Na 2 BaMn ( PO 4 ) 2 under magnetic field
JO  - Physical review / B
VL  - 112
IS  - 17
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2025-04639
SP  - 174429
PY  - 2025
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/kszh-m6bf
UR  - https://juser.fz-juelich.de/record/1048433
ER  -