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Title: Magnetic ordering in perovskites A{sub 1{minus}x}MnO{sub 3+y} (A=La, Bi, rare earth ion) (abstract)

Abstract

In order to clarify the mechanism of exchange interactions in orthomanganites with perovskite structure a magnetic study of parent compounds as a function of stoichiometry has been made. It was shown that the LaMnO{sub 2.99} is a weak ferromagnet with T{sub N}=147 K while LaMnO{sub 3.13} and La{sub 0.9}MnO{sub 3.05} are ferromagnets with T{sub C}=160 and 240 K, respectively. The magnetic data indicate that the mixed magnetic state involving ferro- and antiferromagnetic domains is realized in the intermediate range of oxygen content. The RMnO{sub 3+y} (R=Nd, Sm, Eu, Gd) are inhomogeneous antiferromagnets. The temperatures of start of magnetic moments freezing inside ferromagnetic clusters depend slightly on stoichiometry and for y{approximately}0 are equal 83, 65, 47, and 22 K, respectively. The coercive field for LaMnO{sub 3} is 6 kOe at 4.2 K while that for EuMnO{sub 3} is much higher{emdash}26 kOe. It is worth noting that the Neel temperatures of RMnO{sub 3} (R=Eu, Gd, Tb, Dy) are estimated to be about 40 K independently of the type of rare-earth ion. Magnetic moments of Gd, Tb, and Dy in the rare-earth sublattice are antiferromagnetically ordered below 6{endash}7 K. Applying external fields induces the antiferromagnet{endash}ferromagnet transition in rare-earth sublattice. H{sub cr} at 2more » K for RMnO{sub 3} (R=Gd, Tb, Dy) are measured to be about 5, 12, and 10 kOe, respectively. In contrast to rare-earth compounds, the BiMnO{sub 3} is ferromagnet below 98 K. The deviation from stoichiometry as well as replacement of Bi ions by Sr, Ca, or La ions leads to the suppression of the long-range ferromagnetic order. Magnetic properties are discussed in terms of super exchange interactions between manganese ions via oxygen taking into account the 3d-orbital ordering that occurs in LaMnO{sub 3} and TbMnO{sub 3} at 400 and 1200{degree}C, respectively. {copyright} {ital 1997 American Institute of Physics.}« less

Authors:
;  [1]; ;  [2]
  1. Institute of Physics of Solids and Semiconductors, Academy of Sciences of Belarus, 17, P. Brovki, 220072 Minsk (Belarus)
  2. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw (Poland)
Publication Date:
OSTI Identifier:
496631
Report Number(s):
CONF-961141-
Journal ID: JAPIAU; ISSN 0021-8979; TRN: 97:016314
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 81; Journal Issue: 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; MAGNETIC PROPERTIES; MANGANESE OXIDES; BISMUTH OXIDES; ANTIFERROMAGNETIC MATERIALS; RARE EARTH COMPOUNDS; NEEL TEMPERATURE; LANTHANUM COMPOUNDS; BISMUTH COMPOUNDS; STOICHIOMETRY; COERCIVE FORCE; STRONTIUM IONS; CALCIUM IONS; SAMARIUM IONS; EUROPIUM IONS; GADOLINIUM IONS; MAGNETIC MOMENTS

Citation Formats

Troyanchuk, I O, Kasper, N V, Szymczak, H, and Nabialek, A. Magnetic ordering in perovskites A{sub 1{minus}x}MnO{sub 3+y} (A=La, Bi, rare earth ion) (abstract). United States: N. p., 1997. Web. doi:10.1063/1.364720.
Troyanchuk, I O, Kasper, N V, Szymczak, H, & Nabialek, A. Magnetic ordering in perovskites A{sub 1{minus}x}MnO{sub 3+y} (A=La, Bi, rare earth ion) (abstract). United States. doi:10.1063/1.364720.
Troyanchuk, I O, Kasper, N V, Szymczak, H, and Nabialek, A. Tue . "Magnetic ordering in perovskites A{sub 1{minus}x}MnO{sub 3+y} (A=La, Bi, rare earth ion) (abstract)". United States. doi:10.1063/1.364720.
@article{osti_496631,
title = {Magnetic ordering in perovskites A{sub 1{minus}x}MnO{sub 3+y} (A=La, Bi, rare earth ion) (abstract)},
author = {Troyanchuk, I O and Kasper, N V and Szymczak, H and Nabialek, A},
abstractNote = {In order to clarify the mechanism of exchange interactions in orthomanganites with perovskite structure a magnetic study of parent compounds as a function of stoichiometry has been made. It was shown that the LaMnO{sub 2.99} is a weak ferromagnet with T{sub N}=147 K while LaMnO{sub 3.13} and La{sub 0.9}MnO{sub 3.05} are ferromagnets with T{sub C}=160 and 240 K, respectively. The magnetic data indicate that the mixed magnetic state involving ferro- and antiferromagnetic domains is realized in the intermediate range of oxygen content. The RMnO{sub 3+y} (R=Nd, Sm, Eu, Gd) are inhomogeneous antiferromagnets. The temperatures of start of magnetic moments freezing inside ferromagnetic clusters depend slightly on stoichiometry and for y{approximately}0 are equal 83, 65, 47, and 22 K, respectively. The coercive field for LaMnO{sub 3} is 6 kOe at 4.2 K while that for EuMnO{sub 3} is much higher{emdash}26 kOe. It is worth noting that the Neel temperatures of RMnO{sub 3} (R=Eu, Gd, Tb, Dy) are estimated to be about 40 K independently of the type of rare-earth ion. Magnetic moments of Gd, Tb, and Dy in the rare-earth sublattice are antiferromagnetically ordered below 6{endash}7 K. Applying external fields induces the antiferromagnet{endash}ferromagnet transition in rare-earth sublattice. H{sub cr} at 2 K for RMnO{sub 3} (R=Gd, Tb, Dy) are measured to be about 5, 12, and 10 kOe, respectively. In contrast to rare-earth compounds, the BiMnO{sub 3} is ferromagnet below 98 K. The deviation from stoichiometry as well as replacement of Bi ions by Sr, Ca, or La ions leads to the suppression of the long-range ferromagnetic order. Magnetic properties are discussed in terms of super exchange interactions between manganese ions via oxygen taking into account the 3d-orbital ordering that occurs in LaMnO{sub 3} and TbMnO{sub 3} at 400 and 1200{degree}C, respectively. {copyright} {ital 1997 American Institute of Physics.}},
doi = {10.1063/1.364720},
journal = {Journal of Applied Physics},
number = 8,
volume = 81,
place = {United States},
year = {1997},
month = {4}
}