Diluted magnetic interactions in an oxygen-deficient perovskite cobaltite: magnetoresistance in the series SrCo{sub 1-x}Sc{sub x}O{sub 3-{delta}} (0x=<0.5)
Journal Article
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· Journal of Solid State Chemistry
- Laboratoire de cristallographie et sciences des materiaux, Ecole Nationale Superieure d'Ingenieurs de Caen et Centre de Recherche, UMR 6508 CNRS ISMRA, 6 boulevard du Marechal Juin, 14050 Caen Cedex 4 (France)
A series of the oxygen-deficient perovskite SrCo{sub 1-x}Sc{sub x}O{sub 3-{delta}} has been successfully prepared by using close ampoules for compositions in the range 0.05=<x=<0.5. The unit cell expansion with x is ascribed to the larger Sc{sup 3+} ionic radius than those of the Co{sup 3+}/Co{sup 4+} cations. At 300K, resistivity ({rho}) values of about {approx}10{sup -2}{omega}cm are measured for both x=0.05 and 0.10, but for larger x values {rho} increases, reaching {rho}{sub 300K}=10{sup 2}{omega}cm for x=0.5. For the former, the lower resistivity values result from their weak ferromagnetic behavior characterized by a Curie temperature T{sub C} of {approx}60K. Interestingly, these oxides exhibit similar negative magnetoresistance values, reaching 12% in 7T at 5K, to those reported for the SrFe{sub 1-x}Co{sub x}O{sub 3-{delta}} samples. It is concluded that the simultaneous presence of non-magnetic (3d{sup 0}) Sc{sup 3+} species, substituted for cobalt, and of oxygen vacancies induce magnetic disordering, exemplified by the spin-glass like behavior of SrCo{sub 0.5}Sc{sub 0.5}O{sub 3-{delta}}, which favors the existence of magnetoresistance.
- OSTI ID:
- 20653386
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 10 Vol. 177; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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