Strongly frustrated 2D magnetism in a 3D hexagonal perovskite

Abstract

Exotic quantum phenomena are often found to occur in spin systems that exhibit low-dimensional magnetism. By combining nuclear magnetic resonance, neutron scattering, and muon-spin spectroscopy ($\mu$SR) techniques, we report a rare instance of strongly frustrated two-dimensional (2D) magnetism in a three-dimensional (3D) hexagonal perovskite. Here, Ba${}_2$La${}_2$MnTe${}_2$O${}_{12}$, a triangular-lattice magnet, is shown to undergo a magnetic transition at $T_{\mathrm{N}}\approx$ 4.4 K, below which the manganese moments form a 120${}^{\circ }$ AFM order within the $ab$-plane, while staying disordered along the $c$-axis. This exotic ground state, which exhibits ideal 2D magnetism, is highly consistent with the persistently strong spin fluctuations and the large internal field distributions revealed by zero-field $\mu$SR. Further, the 2D magnetism also leads to a significant frustration, much larger than that of most known magnetically-ordered frustrated systems. Our work on Ba${}_2$La${}_2$MnTe${}_2$O${}_{12}$ not only challenges the interpretations of magnetic order in other 3D hexagonal perovskites, but it also provides insight into how the dimensionality affects the exotic magnetic states.

10 pages, 6 figures

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