Influence of controlled oxygen vacancies on the magnetotransport and magnetostructural phenomena in La{sub 0.85}Sr{sub 0.15}MnO{sub 3{minus}{delta}} single crystals
- Laboratoire de Chimie des Solides, Batiment 414, Universite Paris-Sud, 91405, Orsay Cedex (France)
- Institut dElectronique Fondamentale, Batiment 220, Universite Paris-Sud, 91405, Orsay Cedex (France)
Single crystals of La{sub 0.85}Sr{sub 0.15}MnO{sub 3{minus}{delta}} were prepared with various oxygen vacancies from {delta}=0 to {delta}=0.055. The b and c lattice parameters were found to increase with {delta} whereas the a parameter remains practically constant. The oxygen vacancies are expected to reduce the hole concentration, and therefore the Curie temperature and the electrical conductivity. However, these effects are somewhat different from those observed in the hole-doped La{sub 1{minus}x}Sr{sub x}MnO{sub 3} systems, owing to different lattice distortion. The lattice change of the sample is illustrated by a strong shift in the hyperfine field of Mn{sup 4+} ions, detected with the NMR method. The oxygen deficiency and all the above properties resulting from it were shown to be reversible. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 542235
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 10; Other Information: PBD: Sep 1997
- Country of Publication:
- United States
- Language:
- English
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