- Tytuł:
- Magnetic Properties of the Spin-1 Two-Dimensional $J_{1}$-$J_{3}$ Heisenberg Model on a Triangular Lattice
- Autorzy:
-
Rubin, P.
Sherman, A.
Schreiber, M. - Powiązania:
- https://bibliotekanauki.pl/articles/1368586.pdf
- Data publikacji:
- 2014-07
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
75.10.Jm
67.25.bd - Opis:
- Motivated by the recent experiment in $NiGa_{2}S_{4}$, the spin-1 Heisenberg model on a triangular lattice with the ferromagnetic nearest- and antiferromagnetic third-nearest-neighbor exchange interactions, $J_{1}$ = -(1 - p)J and $J_{3}$ = pJ, J > 0, is studied in the range of the parameter 0 ≤ p ≤ 1. Mori's projection operator technique is used as a method, which retains the rotation symmetry of spin components and does not anticipate any magnetic ordering. For zero temperature several phase transitions are observed. At p ≈ 0.2 the ground state is transformed from the ferromagnetic order into a disordered state, which in its turn is changed to an antiferromagnetic long-range ordered state with the incommensurate ordering vector Q' ≈ (1.16, 0) at p ≈0.31. With growing p the ordering vector moves along the line Q'-$Q_{c}$ to the commensurate point $Q_{c}$ = (2π/3, 0), which is reached at p = 1. The final state with the antiferromagnetic long-range order can be conceived as four interpenetrating sublattices with the 120° spin structure on each of them. Obtained results offer a satisfactory explanation for the experimental data in $NiGa_{2}S_{4}$.
- Źródło:
-
Acta Physica Polonica A; 2014, 126, 1; 242-243
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł