Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 4: Spin structures and magnetic phase transitions

MA 4.3: Vortrag

Montag, 12. März 2018, 10:00–10:15, EB 202

Comparison of diluted antiferromagnetic Ising models on frustrated lattices in a magnetic field — •Konstantin Soldatov¹, Alexey Peretyatko¹, Konstantin Nefedev¹, and Yutaka Okabe² — ¹Far Eastern Federal University, Vladivostok, Russia — ²Tokyo Metropolitan University, Tokyo, Japan

We study diluted antiferromagnetic Ising models on kagome and triangular lattices in a magnetic field, using the replica-exchange Monte Carlo method. We observe five and seven plateaus in the magnetization curve of the diluted antiferromagnetic Ising model on the kagome and triangular lattices, respectively, when a magnetic field is applied. These observations contrast with the two plateaus observed in the pure model. The origin of multiple plateaus is investigated by considering the spin configuration of triangles in the diluted models. We compare these results with those of a diluted antiferromagnetic Ising model on the three-dimensional pyrochlore lattice in a magnetic field pointing in the [111] direction, sometimes referred to as the "kagome-ice" problem. We discuss the similarity and dissimilarity of the magnetization curves of the "kagome-ice" state and the two-dimensional kagome lattice.