Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Cooperative Phenomena and Phase Transitions (joint session MA/TT)

TT 6.13: Vortrag

Montag, 16. März 2020, 12:30–12:45, HSZ 401

Frustration induced highly anisotropic magnetic patterns in classical XY model on kagome lattice — •Alexei Andreanov1 and Mikhail Fistul1,21IBS PCS, Daejeon, Korea — 2Russian Quantum Center, Moscow, Russia

We predict and observed novel highly anisotropic magnetic patterns obtained in the classical XY model on kagome lattice. The frustration is provided by the presence of both ferromagnetic (FM) and anti-ferromagnetic interactions between adjacent magnetic moments. At a critical value of frustration fcr=3/4 the system exhibits a transition from the ferromagnetic state to highly-degenerated ground state. In this regime, fcr< f ≤ 1, the average magnetization ⟨ M ⟩≃ N−1/4 (N is the number of spins). This scaling originates from highly anisotropic character of the groundstates with the FM ordering along the y-direction, and short-range correlations along the x-direction. These features are explained by the presence of the double-degenerate ground state in a single triangle of the kagome lattice supplied witg a large number of constraints. We anticipate the implementation of this model in various systems, e.g. natural magnetic molecular clusters, artificially prepared Josephson junctions networks, trapped-ions and/or photonic crystals.

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