Low-temperature metastable states in a stacked triangular Ising antiferromagnet. (English) Zbl 1260.82022
Summary: We study low-temperature magnetization processes in a stacked triangular Ising antiferromagnet by Monte Carlo simulations. In increasing and decreasing magnetic fields we observe multiple steps and hysteresis corresponding to formation of different metastable states. Besides the equidistant threefold splitting of the 1/3 ferrimagnetic plateau, we additionally confirm a fourth plateau in the field-increasing branch and a sizable remanence when the field is decreased to zero. The newly observed plateau only appears at sufficiently low temperature and sufficiently large exchange interaction in the stacking direction. These observations reasonably reproduce low-temperatures measurements on the spin-chain compound \(\text{Ca}_{3}\text{Co}_{2}\text{O}_{6}\).
MSC:
82B20 | Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs arising in equilibrium statistical mechanics |
82D25 | Statistical mechanics of crystals |
82D40 | Statistical mechanics of magnetic materials |
65C05 | Monte Carlo methods |
Keywords:
Ising antiferromagnet; stacked triangular lattice; geometrical frustration; Monte Carlo simulation; metastable states; magnetization plateauReferences:
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