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Correlation between structural and magnetic properties of La 7/8Sr1/8Mn1-γO3+δ with controlled nonstoichiometry
Li H.F.1; Su Y.1; Persson J.1; Meuffels P.1; Walter J.M.2; Skowronek R.2; Bruckel Th.1
2007-01-10
Source PublicationJournal of Physics Condensed Matter
ISSN09538984 1361648X
Volume19Issue:1
AbstractThe structural and magnetic properties of air sintered and Ar and O annealed LaSrMn O polycrystalline samples have been studied systematically. From the simultaneous refinement of room-temperature x-ray and neutron powder diffraction data, we have found that the crystal structure is orthorhombic (Pbnm, Z ≤ 4; O) for the Ar annealed sample and rhombohedral (, Z ≤ 2; R) for the air sintered and O annealed samples. At the O-R transition, the average Mn-O-Mn bond angle increases from 161.08(4)° (Ar) to 163.38(1)° (O) and 163.64(1)° (air). Ar and O annealings cause a decrease of the Curie temperature T from 240(1) K (air) via 237(1) K (O) to 192(1) K (Ar). The T is reduced by ∼20% for the sample with O structure (Ar) as compared with that of the samples with R structure (air and O). The decrease of T is explained by the decrease of total strength of magnetic interactions, due to the decreased bond angle and increased bond length, and by the decrease of number of nearest magnetic neighbours. The possible reasons for the decrease of the Mn site occupancy after Ar and O annealings and the sources of apparent excess oxygen are discussed. Thus we have shown that the actual distributions of cation vacancies in the A (La and Sr) and B (Mn) sublattices induced by the changes of Mn and oxygen contents through Ar and O annealings play an important role in the structural and magnetic properties. Comparing the Ar annealed with the air sintered sample, a decrease as small as ∼2.2% of the relative oxygen content leads to a remarkably large (∼20%) effect on T. © IOP Publishing Ltd.
DOI10.1088/0953-8984/19/1/016003
URLView the original
Language英語
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Cited Times [WOS]:15   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Affiliation1.Forschungszentrum Jülich (FZJ)
2.Universität Bonn
Recommended Citation
GB/T 7714
Li H.F.,Su Y.,Persson J.,et al. Correlation between structural and magnetic properties of La 7/8Sr1/8Mn1-γO3+δ with controlled nonstoichiometry[J]. Journal of Physics Condensed Matter,2007,19(1).
APA Li H.F.,Su Y.,Persson J.,Meuffels P.,Walter J.M.,Skowronek R.,&Bruckel Th..(2007).Correlation between structural and magnetic properties of La 7/8Sr1/8Mn1-γO3+δ with controlled nonstoichiometry.Journal of Physics Condensed Matter,19(1).
MLA Li H.F.,et al."Correlation between structural and magnetic properties of La 7/8Sr1/8Mn1-γO3+δ with controlled nonstoichiometry".Journal of Physics Condensed Matter 19.1(2007).
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