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Magnetic and Transport Properties of La_{0.67}Pb_{0.33}(Mn_{1-x}Co_x)O_3

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Mihalik M., Kavečanský V., Maťaš S., Zentková M., Ammer J., Kellner K., Gritzner G.

Acta Physica Polonica A

2008

vol. 113

issue 1

251-254

Detailed studies of temperature dependences of magnetization, AC susceptibility and electrical resistance were performed on La_{0.67}Pb_{0.33}(Mn_{1-x}Co_x)O_3 ceramics with x = 0.01 and 0.1. Typical features of both compounds are the hysteretic behavior between the zero-field-cooled magnetization regime and the field-cooled magnetization regime, a very weak field dependence of a maximum in zero-field-cooled magnetization and practically no frequency dependence of the peak in AC susceptibility χ"(T). Anomalies in the electrical resistance connected with the ferromagnetic transition at T_C, the insulator-metal transitions at T_p and the re-entrant metal-isolator transition at T* are field dependent pointing to magnetic origin of these transitions. Colossal magnetoresistance was observed in both compounds.

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1 Acta Physica Polonica A

1 2008

1 Ammer J.

1 Gritzner G.

1 Kavečanský V.

1 Kellner K.

1 Maťaš S.

1 Mihalik M.

1 Zentková M.

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Magnetic and Transport Properties of La_{0.67}Pb_{0.33}(Mn_{1-x}Co_x)O_3