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Volume 32 Issue 3 June 2009 pp 305-312
B Raveau Md Motin Seikh V Pralong V Caignaert
The ordered oxygen deficient `112’ perovskites, LnBaCo2O5.50+𝛿 (Ln = lanthanide or Y), exhibit a very flexible structure which can either uptake (𝛿 > 0) or release oxygen (𝛿 < 0) depending on the experimental conditions of synthesis and on the size of the lanthanide. These compounds exhibit remarkably complex magnetic transitions, metal–insulator transition and exceptionally high magnetoresistance. We show herein that their physics is mainly dominated by three different ferromagnetic states, depending on the cobalt valency: FM1 for 𝛿 = 0 (Co3+), FM2 for 𝛿 < 0 (Co2+/Co3+) and FM3 for 𝛿 > 0 (Co3+/Co4+). The competition between ferromagnetism and antiferromagnetism in these phases and the various transitions are discussed taking into consideration the spin state of cobalt, the issue of phase separation and the effect of cobalt coordination and disproportionation.
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Bulletin of Materials Science
Volume 46, 2023
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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