Abstract
Erythrosiderites with the formula A2FeX5⋅H2O, where A = Rb, K, and (NH4) and X = Cl and Br are intriguing systems that possess various magnetic and electric phases, as well as multiferroic phases in which magnetism and ferroelectricity are coupled. In this report, we study the magnetic phase diagram of erythrosiderites as a function of superexchange interactions and magnetic anisotropies. To this end, we perform classical Monte Carlo simulations on magnetic Hamiltonians that contain five different superexchange interactions with single-ion anisotropies. Our phase diagram contains all magnetic ground states that have been experimentally observed in these materials. We argue that the ground states can be explained by varying the ratio of J4J2. For J4J2>0.95 a cycloidal spins structure is stabilized as observed in (NH4)2FeCl5⋅H2O and otherwise a collinear spin structure is stabilized as observed in (K,Rb)2FeCl5⋅H2O. We also show that the difference in the single-ion anisotropy along a- and c- axes is essential to stabilize the intermediate state observed in (NH)2FeCl5⋅H2O.
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