Effect of cobalt on the magnetoresistance characteristics of rare-earth doped manganites
Jiang Kuo(江阔)a)b)† and Gong Sheng-Kai(宫声凯)b)
a Department of Defence Science and Technology, Southwest University of Science and Technology, Mianyang 621010, China; b Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
Abstract The effect of cobalt-doping on the magnetic, transport and magnetoresistance characteristics of La1-xSrxMnO3 was investigated. The results show that the magnetoelectric property of rare-earth doped manganites is greatly affected by substitution of Co for Mn sites. The Curie temperature as well as the magnetic moment decreases with the increase of doping concentration, and the samples exhibit obvious characteristics of the spin glass state. Moreover, the magnetoresistance is evidently modulated by doping concentration, and the relevant temperature dependence is also suppressed. In addition, low-temperature magnetoresistance is significantly promoted as doping concentration increases, which renders a value of approximately 50% in the temperature range of 5--200 K and varies within 12.5%. It can be attributed to the effect of spin scattering, induced by cobalt doping, on the itinerant electrons of Mn ions, thus introducing a spin-disorder region into the ferromagnetic region of double-exchange interaction between neighbouring Mn3+ and Mn 3+ ions.
Received: 28 July 2008
Revised: 02 March 2009
Accepted manuscript online:
Fund: Project suppprted by the doctor
start-up fund of the Southwest University
of Science and Technology of China (Grant No 07ZX0110).
Cite this article:
Jiang Kuo(江阔) and Gong Sheng-Kai(宫声凯) Effect of cobalt on the magnetoresistance characteristics of rare-earth doped manganites 2009 Chin. Phys. B 18 3035
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