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Orbitally induced hierarchy of exchange interactions in zigzag antiferromagnetic state of honeycomb silver delafossite Ag3Co2SbO6статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 9 марта 2017 г.
- Авторы: Zvereva Elena A., Stratan Mikhail I., Ushakov Alexey V., Nalbandyan Vladimir B., Shukaev Igor L., Silhanek Alejandro V., Abdel-Hafiez Mahmoud, Streltsov Sergey V., Vasiliev Alexander N.
- Журнал: Dalton Transactions
- Том: 45
- Год издания: 2016
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 7373
- Последняя страница: 7384
- DOI: 10.1039/C6DT00516K
- Аннотация: We report the revised crystal structure, static and dynamic magnetic properties of quasi-two dimensional honeycomb-lattice silver delafossite Ag3Co2SbO6. The magnetic susceptibility and specific heat data are consistent with the onset of antiferromagnetic long range order at low temperatures with Néel temperature T_N ~ 21.2 K. In addition, the magnetization curves revealed a field-induced (spin-flop type) transition below T_N in moderate magnetic fields. The GGA+U calculations show the importance of the orbital degrees of freedom, which maintain a hierarchy of exchange interaction in the system. The strongest antiferromagnetic exchange coupling was found in the shortest Co-Co pairs and is due to direct and superexchange interaction between the half-filled xz+yz orbitals pointing directly to each other. The other four out of six nearest neighbor exchanges within the cobalt hexagon are suppressed, since for these bonds active half-filled orbitals turned out to be parallel and do not overlap. The electron spin resonance (ESR) spectra reveal a broad absorption line attributed to Co2+ ion in octahedral coordination with average effective g-factor g=2.40+/-0.05 at room temperature and show strong divergence of ESR parameters below ~ 150 K, which implies an extended region of short-range correlations. Based on the results of magnetic and thermodynamic studies in applied fields, we propose the magnetic phase diagram for the new honeycomb-lattice delafossite.
- Добавил в систему: Зверева Елена Алексеевна