MAGNETIC PHASE-DIAGRAM OF THE FERROMAGNETICALLY STACKED TRIANGULAR ISING ANTIFERROMAGNET

Histogram Monte-Carlo simulation results are presented for the magneti c-field-temperature phase diagram of the Ising model on a stacked tria ngular lattice with antiferromagnetic intraplane and ferromagnetic int erplane interactions, Finite-size scaling results for this frustrated system at three points along the paramagnetic transition boundary are presented which strongly suggest a line of triciritcal points at low f ield and a first-order transition line at higher fields. These results are compared with the corresponding phase diagrams from conventional mean-field theory as well as from Monte Carlo mean-field calculations.