Wide-Range Tuning of the Mo Oxidation State in La1–xSrxFe2/3Mo1/3O3 Perovskites

Авторы: Istomin Sergey Ya, Chernova Varvara V., Antipov Evgeny V., Lobanov Maxim V., Bobrikov Ivan A., Yushankhai Viktor Yu, Balagurov Anatoly M., Hsu K.Y., Lin J.Y., Chen J.M., Lee J.F., Volkova Olga S., Vasiliev Alexander N.
Журнал: European Journal of Inorganic Chemistry
Год издания: 2016
Издательство: John Wiley & Sons Ltd.
Местоположение издательства: United Kingdom
DOI: 10.1002/ejic.201600020
Аннотация: La1–xSrxFe2/3Mo1/3O3 (0 ≤ x ≤ 1) perovskites allow exceptionally wide tuning of the Mo oxidation state from +3 (x =0) to +6 (x = 1) with the FeIII oxidation state virtually unchanged. The end members of this series show antiferromagnetic ordering in LaFe2/3Mo1/3O3 at TN = 520 K and ferrimagnetic ordering in SrFe2/3Mo1/3O3 at TC = 420 K. The crucial role of electron correlations in the Mo 4d shell suggests that LaFe2/3Mo1/3O3 with a half-filled band is a Mott insulator, whereas SrFe2/3Mo1/3O3 is a band insulator. In both cases, the magnetic structure is dictated by antiferromagnetic superexchange between localized magnetic moments. At intermediate compositions, an interplay of antiferromagnetic-superexchange and double-exchange interactions results in nonmonotonous variations of both the magnetic-ordering temperature and saturation magnetization.
Добавил в систему: Истомин Сергей Яковлевич

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