The study of magnetic frustration in classical spin systems is motivated by the prediction and discovery of classical spin liquid states. These uncommon magnetic phases are characterized by a massive degeneracy of their ground state implying a finite magnetic entropy at zero temperature. While the classical spin liquid state is originally predicted in the Ising triangular lattice antiferromagnet in 1950, this state has never been experimentally observed in any triangular magnets. The discovery of an electric analogue of classical spin liquids on a triangular lattice of uniaxial electric dipoles in EuAl12O19 is reported here. This new type of frustrated antipolar phase is characterized by a highly-degenerate state at low temperature implying an absence of long-range antiferroelectric order, despite short-range antipolar correlations. Its dynamics are governed by a thermally activated process, slowing down upon cooling toward a complete freezing at zero temperature.

Department of Condensed Matter Physics Faculty of Mathematics and Physics Charles University Ke Karlovu 5 Prague 2 121 16 Czech Republic

Department of Solid State Engineering Faculty of Nuclear Sciences and Physical Engineering Czech Technical University Prague Břehová 7 Prague 1 115 19 Czech Republic

Diamond Light Source Chilton Didcot Oxfordshire OX11 0DE UK

Institute of Physics of the Czech Academy of Sciences Na Slovance 2 Prague 182 00 Czech Republic

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