Magnetotransport and magnetic properties of weak ferromagnetic semiconductors: Ca doped LaCrO3

American Institute of Physics
Publication Type:
Journal Article
Alvarez Gustavo et al. 2008, 'Magnetotransport and magnetic properties of weak ferromagnetic semiconductors: Ca doped LaCrO3', American Institute of Physics, vol. 103, no. 7, pp. 07B916-1-07B916-3.
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We report the magnetic and magnetotransport properties of Ca doped La1-xCaxCrO3 (x=0, 0.1, 0.2, and 0.3). Both the magnetic and transport properties are very sensitive to Ca substitution. The Neel temperature TN decreases substantially with increasing calcium doping concentration from 290 to 160 K. A weak ferromagnetic state with large coercive fields of up to 3 T is present for the Ca doped LaCrO3. The temperature dependence of the resistivity shows that all the Ca doped compounds are semiconducting and their resistivities decrease with increasing Ca for low doping levels. The resistivity curves show thermally activated behavior and a variable range hopping behavior at high temperatures. The magnetotransport measurements show a negative magnetoresistance. Furthermore, an anomalous peak was observed in the field dependence of magnetoresistance for the LCCO materials.
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