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High-frequency dielectric anomalies in a highly frustrated square kagomé lattice nabokoite family compounds ACu7(TeO4)(SO4)5Cl (A=Na,K,Cs,Rb)
Journal of Magnetism and Magnetic Materials. 2024. Vol. 592. Article 171786.
Nabokoite family compounds ACu7(TeO4)(SO4)5Cl (A = Na, K, Cs, Rb) are candidates for the experimental realization of highly-frustrated 2D square kagomé lattice (SKL). Their magnetic subsystem includes SKL layers decorated by additional copper ions. All members of this family are characterized by quite high Curie–Weiss temperatures ( 80–200 K), but magnetic ordering was reported only for Na and K compounds at a much lower temperatures below 4 K. We report here results of the study of high-frequency ( ~10 GHz) dielectric properties of this family of compounds. Our study revealed presence of the strong dielectric anomaly both in the real and imaginary parts of high-frequency dielectric permittivity for Na and K compounds approx. 100 and 26 K, correspondingly, presumably related to antiferroelectric ordering. Additionally, much weaker anomalies were observed at approx. 5 K indicating possible interplay of magnetic and lattice degrees of freedom. We discuss possible relation between the structure rearrangements accompanying dielectric anomalies and a delayed magnetic ordering in the nabokoite family compounds.
Keywords: frustrated magnets
Publication based on the results of:
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