Magnetic and Transport Properties of La0.67Pb0.33(Mn1-xCox)O3

M. Mihalik a, V. Kavečanský a, S. Maťaš a, M. Zentková a, J. Ammer b, K. Kellner b and G. Gritzner b a Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 040 01 Košice, Slovak Republic b Institute for Chemical Technology of Inorganic Materials, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria

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Received: 9 07 2007;

Detailed studies of temperature dependences of magnetization, AC susceptibility and electrical resistance were performed on La0.67Pb0.33(Mn1-xCox)O3 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 TC, the insulator-metal transitions at Tp 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.

DOI: 10.12693/APhysPolA.113.251 PACS numbers: 71.30.+h, 72.80.Ga, 75.20.Hr, 75.30.Et, 75.30.Vn