Gigantic effect of iron doping upon magnetism in the «114» magnetoelectric CaBaCo4O7

M.M. Seikh (1, 2) , A.K. Kundu (2, 3) , V. Caignaert (2) , B. Raveau (2)

1 Visva Bharati University
2 CRISMAT - Laboratoire de cristallographie et sciences des matériaux
3 IIIDTM Jabalpur - Indian Institute of Information Technology, Design and Manufacturing

The investigation of the CaBaCo4-xFex07 oxide shows that a huge decrease of ferrimagnetism is produced for very low Fe contents (x andlt; 0.05) at the benefit of magnetic phase separation and magnetic frustration. This gigantic effect of iron doping at the Co3+ sites in CaBaCo4O7 is compared to that produced by diamagnetic Ga3+ and Al3+ dopants, showing that the antiferromagnetic interactions between the dopant Fe3+ and the Co2+ ferromagnetic chains has a crucial role in the destabilization of the ferrimagnetic structure, whereas the triangular geometry of the cobalt sublattice imposes the appearance of magnetic frustration. © 2015 Elsevier B.V. All rights reserved.

Keywords: Cobaltite; Ferrimagnetism; Magnetic frustration; Magnetoelectric; Phase separation

Domains: Chemical Sciences; Chemical Sciences; Cristallography; Chemical Sciences; Theoretical and/or physical chemistry; Chemical Sciences; Material chemistry

M.M. Seikh, A.K. Kundu, V. Caignaert, B. Raveau. Gigantic effect of iron doping upon magnetism in the «114» magnetoelectric CaBaCo4O7. Journal of Alloys and Compounds, 2016, 656, pp.166-171. ⟨10.1016/j.jallcom.2015.08.257⟩. ⟨hal-02184783⟩