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Local Melting of Charge Ordering in CaBaCo 4 O 7 by Sr‐Doping
Author(s) -
Seikh Md. Motin,
Pralong Valérie,
Caignaert Vincent,
Raveau Bernard
Publication year - 2014
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201300671
Subject(s) - ferrimagnetism , condensed matter physics , orthorhombic crystal system , frustration , valence (chemistry) , materials science , charge ordering , crystal structure , crystallography , charge (physics) , magnetization , chemistry , physics , magnetic field , quantum mechanics
The isovalent substitution of strontium for barium in CaBaCo 4 O 7 destroys the ferrimagnetism in a striking way though it keeps the same orthorhombic crystal symmetry and cobalt valence as the parent phase. The gradual weakening of ferrimagnetism in CaBa 1– x Sr x Co 4 O 7 (0 < x ≤ 0.10) leaves place to magnetic frustration together with antiferrimagnetism. The phase separation that appears, due to the strong competition between long range ferrimagnetic ordering and magnetic frustration, is interpreted by local melting of charge ordering. The latter originates from local structural distortion around the Ba(Sr) site. The dynamic scaling theory, τ = τ 0 ( T f / T g – 1) – zv , suggests that the frustrated magnetic phase is cluster glass in nature with strongly interacting spins. This finding reveals that the orthorhombic symmetry in CaBaCo 4 O 7 is not a sufficient condition to manifest ferrimagnetic ordering.