Structure, magnetic and transport properties of La0.7-xBixCa0.3MnO3 (0.05 less than or equal to x less than or equal to 0.7) manganites have been studied. Samples with x less than or equal to 0.15 show ferromagnetic behaviour. For higher concentrations an important influence of antiferromagnetic interactions has been observed. The La0.5Bi0.2Ca0.3MnO3 sample shows an antiferro-ferromagnetic transition induced by the applied field and the Bi0.7Ca0.3MnO3 composition is an antiferromagnet, but ferromagnetic interactions are still present. The resistivity of the samples shows a semiconductor-metallic transition for x less than or equal to 0.15. For x = 0.2 and 0.7 the compounds exhibit insulating behaviour down to 10 K, but a field induced transition to a metallic state is found in La0.5Bi0.2Ca0.3MnO3. The results are discussed in terms of the charge localization probably due to the covalent character of the Bi.

Structure, magnetic and trasport properties in La0.7-xBixCa0.3MnO3 (0.05≤ x ≤ 0.7 ) perovskites / RIGHI L.; GUTIRREZ J.; BARANDIARN J.M.. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 11:13(1999), pp. 2831-2840. [10.1088/0953-8984/11/13/017]

Structure, magnetic and trasport properties in La0.7-xBixCa0.3MnO3 (0.05≤ x ≤ 0.7 ) perovskites

RIGHI, Lara;
1999

Abstract

Structure, magnetic and transport properties of La0.7-xBixCa0.3MnO3 (0.05 less than or equal to x less than or equal to 0.7) manganites have been studied. Samples with x less than or equal to 0.15 show ferromagnetic behaviour. For higher concentrations an important influence of antiferromagnetic interactions has been observed. The La0.5Bi0.2Ca0.3MnO3 sample shows an antiferro-ferromagnetic transition induced by the applied field and the Bi0.7Ca0.3MnO3 composition is an antiferromagnet, but ferromagnetic interactions are still present. The resistivity of the samples shows a semiconductor-metallic transition for x less than or equal to 0.15. For x = 0.2 and 0.7 the compounds exhibit insulating behaviour down to 10 K, but a field induced transition to a metallic state is found in La0.5Bi0.2Ca0.3MnO3. The results are discussed in terms of the charge localization probably due to the covalent character of the Bi.
Structure, magnetic and trasport properties in La0.7-xBixCa0.3MnO3 (0.05≤ x ≤ 0.7 ) perovskites / RIGHI L.; GUTIRREZ J.; BARANDIARN J.M.. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 11:13(1999), pp. 2831-2840. [10.1088/0953-8984/11/13/017]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/1460153
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