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Effects of magnesium substitution on the magnetic properties of Nd0.7Sr0.3MnO3
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
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2005 (English)In: Journal of Solid State Chemistry, ISSN 0022-4596, E-ISSN 1095-726X, Vol. 178, no 4, 1203-1211 p.Article in journal (Refereed) Published
Abstract [en]

Effects of magnesium substitution on the magnetic properties of Nd0.7Sr0.3MnO3 have been investigated by neutron powder diffraction and magnetization measurements on polycrystalline samples of composition Nd0.7Sr0.3MnO3, Nd0.6Mg0.1Sr0.3MnO3, Nd0.6Mg0.1Sr0.3Mn0.9Mg0.1O3, and Nd0.6Mg0.1Sr0.3Mn0.8Mg0.2O3. The pristine compound Nd0.7Sr0.3MnO3 is ferromagnetic with a transition temperature occurring at about 210 K. Increasing the Mg-substitution causes weakened ferromagnetic interaction and a great reduction in the magnetic moment of Mn. The Rietveld analyses of the neutron powder diffraction (NPD) data at 1.5 K for the samples with Mg concentration, y=0.0 and 0.1, show ferromagnetic Mn moments of 3.44(4) and 3.14(4) μB, respectively, which order along the [001] direction. Below 20 K the Mn moments of these samples become canted giving an antiferromagnetic component along the [010] direction of about 0.4 μB at 1.5 K. The analyses also show ferromagnetic polarization along [001] of the Nd moments below 50 K, with a magnitude of almost 1 μB at 1.5 K for both samples. In the samples with Mg substitution of 0.2 and 0.3 only short range magnetic order occurs and the magnitude of the ferromagnetic Mn moments is about 1.6 μB at 1.5 K for both samples. Furthermore, the low-temperature NPD patterns show an additional very broad and diffuse feature resulting from short range antiferromagnetic ordering of the Nd moments.

Place, publisher, year, edition, pages
2005. Vol. 178, no 4, 1203-1211 p.
Keyword [en]
(Perovskite) manganites, Neutron powder diffraction, Magnesium substitution, Magnetic moment, Ferromagnetic, Transition temperature, Antiferromagnetic
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-92726DOI: 10.1016/j.jssc.2005.01.018OAI: oai:DiVA.org:uu-92726DiVA: diva2:165907
Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides
Open this publication in new window or tab >>Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Synthesis, nuclear structure, and magnetic properties of the perovskites: Nd0.7-xMgxSr0.3MnO3 (x=0.0, 0.1), Nd0.6Mg0.1Sr0.3Mn1-zMgzO3 (z=0.1, 0.2), LaCr1-yMnyO3 (y=0.0, 0.1, 0.2, 0.3) and La1-xNdxFe0.5Cr0.5O3 (x=0.1, 0.15, 0.2) have been studied. The structure of the samples was investigated by X-ray and Neutron powder diffraction and the magnetic properties were investigated by magnetization measurements using SQUID-magnetometry. All compounds have orthorhombic structure with spacegroup Pnma (No. 62).

The compounds which had the composition Nd0.7Sr0.3Mn1-yMgyO3 by preparation, were found to attain the composition Nd0.7-xMgxSr0.3MnO3 and Nd0.6Mg0.1Sr0.3Mn1-zMgzO3. The x=0.0 and 0.1 compounds order in a pure ferromagnetic structure at about 200 K, but the Mn moments become slightly tilted and attain an antiferromagnetic component below 20 K. A ferromagnetic Nd moment also appears at low temperatures. The compounds with Mg substitution y=0.2 and 0.3 do not exhibit long range magnetic order, but local ferromagnetic correlations among the Mn moments appear below 200 K. At low temperature, also a local antiferromagnetic ordering of the Nd magnetic moments occurs. In these compounds, the Mn3+/Mn4+ ratio is reduced so that the double exchange interaction is suppressed and the antiferromagnetic superexchange interaction favoured.

The samples of composition LaCr1-yMnyO3 have orthorhombic structure at room temperature and below. The magnetic properties of the system are markedly affected by Mn-substitution. The parent compound LaCrO3 is a pure G-type antiferromagnet with Néel temperature 290 K. With incresing Mn-substitution, a ferromagnetic component developes in the ordered phase bcause of canting of the magnetic moments. The degree of canting increases with increasing Mn-substitution and the magnitude of the antiferromagnetic component of the moment decreases. The system La1-xNdxFe0.5Cr0.5O3 has the same antiferromagnetic G-type structure as LaCrO3, but orders already at temperatures above 400 K and develops only a very weak ferromagnetic component of the magnetic moment at low temperatures.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 50 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 24
Keyword
Materials science, Magnetic Perovskites, Neutron powder diffraction, SQUID, Synthesis, Nuclear structure, Antiferromagnetism, Ferromagnetism, Superexchange, Double exchange, Colossal magnetoresistance, Materialvetenskap
National Category
Materials Engineering
Identifiers
urn:nbn:se:uu:diva-4826 (URN)91-554-6175-1 (ISBN)
Public defence
2005-04-07, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
Supervisors
Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2009-03-27Bibliographically approved

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Mathieu, RolandNordblad, Per

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