Canted structures in the Mn{sup 3+}/Mn{sup 4+} perovskites

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364669· OSTI ID:496635

Jirak, Z; Hejtmanek, J; Pollert, E; Marysko, M ^[1]; Dlouha, M; Vratislav, S ^[2]

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1. Institute of Physics of ASCR, Cukrovarnicka 10, 16200 Prague 6 (Czech Republic)
2. Faculty of Nuclear Physics and Physical Engineering, 18000 Prague 8 (Czech Republic)

Neutron diffraction and magnetization measurements have been performed on numerous systems with the divalent and monovalent substitution, Pr{sub 1{minus}x}A{sub x}{sup 2+}Mn{sub 1{minus}x}{sup 3+}Mn{sub x}{sup 4+}O{sub 3} (A=Ca, Sr, Ba) and Pr{sub 1{minus}x/2}A{sub x/2}{sup +}Mn{sub 1{minus}x}{sup 3+}Mn{sub x}{sup 4+}O{sub 3} (A=Na, K). The study shows that the transition from the A{sub y}-type (layer) antiferromagnetism in pure PrMnO{sub 3} to the ferromagnetism in the mixed-valence systems is not continuous. In a range of about 5{percent}{endash}15{percent} of Mn{sup 4+} (x{approximately}0.05{endash}0.15), canted magnetic arrangements of the A{sub y}F{sub z} type are observed. The interlayer coupling is changed gradually from {theta}=180{degree} for x=0{endash}0.05 to {theta}{approximately}90{degree} for x=0.15. For about x=0.15{endash}0.20, the canted phase with 90{degree} coupling coexists with a purely ferromagnetic arrangement of the F{sub y} type. The observed behavior is related to an interplay of the magnetic superexchange and the double exchange. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496635
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

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