Insulator-metal transition induced by Cr and Co doping in Pr{sub 0.5}Ca{sub 0.5}MnO{sub 3}
- ISMRA et Universite de Caen (France)
The study of the perovskite manganites Pr{sub 0.5}Ca{sub 0.5}Mn{sub 1-x}M{sub x}O{sub 3} with M=Cr and Co has been carried out. It shows that the doping of the insulating antiferromagnetic phase Pr{sub 0.5}Ca{sub 0.5}MnO{sub 3} with chromium or cobalt induces an insulator to metal transition. This behavior is exceptional since such a transition has never been observed to date in charge ordered manganites Ln{sub 0.5}CA{sub 0.5} MnO{sub 3} with an A-site cation of such a small size (Ln=Pr). The transition temperature to the ferromagnetic metallic state ranges from 110 to 150K and from 60 to 80K for chromium and cobalt, respectively. These Cr- and Co-doped manganites exhibit colossal magnetoresistance properties with resistance ratios (R{sub 0}/R{sub 7T}) ranging from 3x10{sup 4} at 60K to 30 at 150K for chromium and from 3x10{sup 6} at 60K to 2x10{sup 4} at 75K for cobalt.
- OSTI ID:
- 543098
- Journal Information:
- Journal of Solid State Chemistry, Vol. 130, Issue 1; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Cation disorder and size effects upon magnetic transitions in Ln{sub 0.5}A{sub 0.5}MnO{sub 3} manganites
Magnetic and structural transitions in the half-doped manganites Pr{sub 0.5}Sr{sub 0.5-x}Ca{sub x}MnO{sub 3}