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Author Martin, M. C. ♦ Shirane, G. ♦ Endoh, Y. ♦ Hirota, K. ♦ Moritomo, Y. ♦ Tokura, Y.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ LANTHANUM OXIDES ♦ MAGNETIC PROPERTIES ♦ STRONTIUM OXIDES ♦ MANGANESE OXIDES ♦ CRYSTAL STRUCTURE ♦ NEUTRON DIFFRACTION ♦ SPIN WAVES ♦ FERROMAGNETIC MATERIALS ♦ ELECTRON TRANSFER
Abstract Neutron scattering studies on a single crystal of the highly correlated electron system, La{sub 1{minus}{ital x}}Sr{sub {ital x}}MnO{sub 3} with {ital x}{approx_equal}0.3, have been carried out elucidating both the spin and lattice dynamics of this metallic ferromagnet. We report a large measured value of the spin wave stiffness constant, which directly shows that the electron transfer energy of the {ital d} band is large. The spin dynamics, including magnetic critical scattering, demonstrate that this material behaves similar to other typical metallic ferromagnets such as Fe or Ni. The crystal structure is rhombohedral, as previously reported, for all temperatures studied (below {approximately}425 K). We have observed superlattice peaks which show that the primary rhombohedral lattice distortion arises from oxygen octahedra rotations resulting in an {ital R}{bar 3}{ital c} structure. The superlattice reflection intensities, which are very sensitive to structural changes, are independent of temperature demonstrating that there is no primary lattice distortion anomaly at the magnetic transition temperature {ital T}{sub {ital C}}=378.1 K; however, there is a lattice contraction. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-06-01
Publisher Department Brookhaven National Lab. (BNL), Upton, NY (United States)
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 21
Organization Brookhaven National Lab. (BNL), Upton, NY (United States)


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