Spin State Transition in LaCoO

Journal Article · Tue May 01 04:00:00 EDT 2001 · Journal of Solid State Chemistry

OSTI ID:784434

Toulemonde, O; N'Guyen, N; Studer, F; Traverse, A

An X-ray absorption spectroscopy study of the polycrystalline La{sub 1-x}Sr{sub x}CoO{sub 3} (x=0, 0.25, 0.5) series at O K-edge was performed above and below the various magnetic transition temperatures. A crystal field analysis is proposed to explain the observed fine structure changes. Temperature-dependent O K-edge of LaCoO{sub 3} shows evidence of smooth and continuous spin transition of Co{sup 3+} from low to intermediate spin states. This result is confirmed by cobalt K-edge measurements. Upon strontium doping, O K-edges of the La{sub 1-x}Sr{sub x}CoO{sub 3} (x=0, 0.25, 0.5) series suggested a mixed (LS-IS) Co{sup 3+}/IS Co{sup 4+} cobalt ion configuration. The fundamental mechanism governing the magnetotransport properties shown by the compounds is then discussed.

• Research Organization: Laboratoire CRISMAT, CNRS-UMR 6508, ISMRA, Bovlevard du Mal Juin, Caen (FR); Laboratoire Lure, bat 209D, Centre Universtaire Paris-Sud, Orsay (FR)
• Sponsoring Organization: US Department of Energy (US)
• OSTI ID: 784434
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 2 Vol. 158; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
COBALT
COBALT IONS
COBALT OXIDES
CONFIGURATION
CRYSTAL FIELD
DOPED MATERIALS
ELECTRONIC STRUCTURE
EXPERIMENTAL DATA
FINE STRUCTURE
LANTHANUM OXIDES
MAGNETIC PROPERTIES
SPIN
STRONTIUM
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
TRANSPORT THEORY
X-RAY SPECTROSCOPY