Neutron scattering investigation of the structure and spin dynamics in La{sub 0.85}Sr{sub 0.15}MnO{sub 3}

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364846· OSTI ID:496597

Vasiliu-Doloc, L; Lynn, J W ^[1]; Moudden, A H ^[2]; de Leon-Guevara, A M; Revcolevschi, A ^[3]

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1. Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
2. Laboratoire Leon Brillouin, CEA-CNRS, CE/Saclay, 91191 Gif sur Yvette Cedex (France)
3. Laboratoire de Chimie des Solides, Universite Paris-Sud, 91405 Orsay (France)

We have performed diffraction and inelastic neutron scattering experiments on a La{sub 0.85}Sr{sub 0.15}MnO{sub 3} single crystal. In the ferromagnetic phase of this system (T{sub c}=235 K) the long wavelength dispersion relation along the (0,1,0) direction is well represented by E=E{sub 0}+Dq{sup 2}, but with the spin wave spectrum almost gapless (E{sub 0}{lt}0.1 meV), and with D{sub T=0}=83.75{plus_minus}0.36 meV{Angstrom}{sup 2}. The spin-wave stiffness constant D(T) exhibits a power law behavior as a function of temperature, and appears to collapse as T{r_arrow}T{sub c}. An orthorhombic{endash}rhombohedral structural phase transition is observed at T{sub s}=360 K, and exhibits a hysteretic character suggesting a first-order transformation. Anomalies in magnetization measurements and Bragg peak intensities indicate the existence of a second phase transition at T=200 K. {copyright} {ital 1997 American Institute of Physics.}

• OSTI ID: 496597
• Report Number(s): CONF-961141--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
CRYSTAL STRUCTURE
FERROMAGNETIC MATERIALS
INELASTIC SCATTERING
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIZATION
MANGANESE OXIDES
MONOCRYSTALS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
SPIN WAVES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES