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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, Rb, Cs)статья
- Авторы: Rebrov Ya V., Glazkov V.N., Murtazoev A.F., Dolgikh V.A., Berdonosov P.S.
- Журнал: Journal of Magnetism and Magnetic Materials
- Год издания: 2024
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Номер статьи: 171786
- DOI: 10.1016/j.jmmm.2024.171786
- Аннотация: 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.
- Добавил в систему: Бердоносов Петр Сергеевич