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Wide‐Range Tuning of the Mo Oxidation State in La1–xSrxFe2/3Mo1/3O3 Perovskites
Author(s) -
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.
Publication year - 2016
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201600020
Subject(s) - superexchange , antiferromagnetism , ferrimagnetism , chemistry , condensed matter physics , magnetization , mott insulator , magnetic moment , crystallography , physics , magnetic field , quantum mechanics
La 1– x Sr x Fe 2/3 Mo 1/3 O 3 (0 ≤ x ≤ 1) perovskites allow exceptionally wide tuning of the Mo oxidation state from +3 ( x = 0) to +6 ( x = 1) with the Fe III oxidation state virtually unchanged. The end members of this series show antiferromagnetic ordering in LaFe 2/3 Mo 1/3 O 3 at T N = 520 K and ferrimagnetic ordering in SrFe 2/3 Mo 1/3 O 3 at T C = 420 K. The crucial role of electron correlations in the Mo 4d shell suggests that LaFe 2/3 Mo 1/3 O 3 with a half‐filled band is a Mott insulator, whereas SrFe 2/3 Mo 1/3 O 3 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.