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Author Mitchell, J. F. ♦ Millburn, J. E. ♦ Medarde, M. ♦ Argyriou, D. N. ♦ Jorgensen, J. D.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ PHYSICS ♦ STRONTIUM COMPOUNDS ♦ PEROVSKITES ♦ STRONTIUM OXIDES ♦ MANGANESE OXIDES ♦ NEUTRON DIFFRACTION ♦ CRYSTAL STRUCTURE ♦ ANTIFERROMAGNETIC MATERIALS ♦ IPNS-I SYNCHROTRON ♦ VACANCIES ♦ MAGNETIC PROPERTIES
Abstract We report powder neutron diffraction results on the crystal and magnetic structures of the bilayer Ruddlesden{endash}Popper phase Sr{sub 3}Mn{sub 2}O{sub 7{minus}{delta}}&hthinsp;({delta}=0.0,&hthinsp;0.45) and correlate these structures with their magnetic and transport properties. The {delta}=0.45 compound contains a large number of oxygen vacancies that are disordered in the MnO{sub 2} planes. As a result of this disordered vacancy structure, Sr{sub 3}Mn{sub 2}O{sub 6.55} is a nonmagnetic insulator. Sr{sub 3}Mn{sub 2}O{sub 7.0}&hthinsp;({delta}=0) is an antiferromagnetic insulator whose magnetic structure is related to that of the SrMnO{sub 3} perovskite. Comparison of this end-member compound to its doped congeners in the La{sub 2{minus}2x}Sr{sub 1+2x}Mn{sub 2}O{sub 7} series highlights the extreme sensitivity of magnetic structure to dopant concentration in these layered materials. {copyright} {ital 1999 American Institute of Physics.}
ISSN 00218979
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-04-01
Publisher Place United States
Journal Journal of Applied Physics
Volume Number 85
Issue Number 8


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