Detailed study of temperature dependencies of AC susceptibility, magnetization and electrical resistance was performed on La0.67Ca0.33(Mn1-xCox)O3 ceramics for x = 0.01, 0.03, 0.06, 0.1, 0.15. All compounds undergo the paramagnetic-ferromagnetic phase transition between 240 K and 60 K. Basic magnetic characteristics, like the Curie temperature and the saturated magnetization, decrease with Co-substitution Very weak frequency dependence of the peak in AC susceptibility χ’’(T), hysteretic behavior between zero-field-cooled magnetization regime and field-cooled magnetization regime are typical feature of all compounds. Anomalies in electrical resistance connected with the ferromagnetic transition at the Curie temperature, the insulator-metal transitions and the re-entrant metal-isolator transition are field dependent pointing to magnetic origin of these transitions. The colossal magneto-resistance was observed for all compounds. Sintering in different atmosphere (O2 or Ar) affects electrical resistance significantly
Sprache der Kurzfassung:
Englisch
Journal:
Journal of Electrical Engineering
Volume:
59
Seitenreferenz:
107 - 110
Erscheinungsjahr:
2008
ISSN:
1339-309X
Anzahl der Seiten:
4
Notiz zur Publikation:
Magnetic Properties of La0.67Ca0.33(CoxMn1-x)O3, Marián Mihalik. Slavomír Maťaš, Mária Zentková and Gerhard Gritzner, Journal of Electrical Engineering 59 (2008) 107 - 110
Reichweite:
international
Publikationstyp:
Aufsatz / Paper in sonstiger referierter Fachzeitschrift