Relaxor unveils geometrical frustration

Talanov, M.V.; Avakyan, L.A.; Kozlov, V.I.; Ivanov, S.A.; Stash, A.I.; Zhukova, E.S.; Gorshunov, B.P.; Bush, A.A.

Авторы: Talanov Mikhail V., Avakyan Leon A., Kozlov Vladislav I., Ivanov Sergey A., Stash Adam I., Zhukova Elena S., Gorshunov Boris P., Bush Alexander A.
Журнал: Acta Materialia
Том: 277
Год издания: 2024
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 120172
DOI: 10.1016/j.actamat.2024.120172
Аннотация: For over a century, materials science has been focused on comparing magnetism and ferroelectricity, revealingsimilarities in order types, domains, hysteresis, and responses to external stimuli. The exceptional physicalproperties of magnets often originate from frustration, which can result from site disorder and lattice geometry.While disordered relaxor ferroelectrics exhibit ultra-high dielectric and piezoelectric properties and fingerprintedbehavior similar to spin glasses, ferroelectric-like materials with clear geometrically frustrated states have notbeen previously identified. Here we introduce a new type of relaxor material, a geometrically frustrated relaxor,exemplified by a Bi2Ti2O7 single crystal with a compositionally ordered pyrochlore structure. Our findingsdemonstrate canonical relaxor behavior, including dielectric anomalies, dipole freezing, non-ergodicity and alack of spontaneous phase transitions. Furthermore, we show the emergence of a unique dipole ice state uponcooling, arising from conflicting order parameters related to two mutually exclusive rigid unit modes of Bi4Oʹtetrahedral rotations. The coexistence of these rotations does not satisfy symmetry constraints, causinggeometrical frustration and suppressing the long-range order. The results provide the structural mechanism ofgeometrical frustration manifestation in Bi-containing pyrochlores, opening up avenues for exploring exoticground states and advanced functionalities in dielectric materials.
Добавил в систему: Сташ Адам Игаркович

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