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

被引:11
作者
Alvarez, G. A. [1 ]
Wang, X. L. [1 ]
Peleckis, G. [1 ]
Dou, S. X. [1 ]
Zhu, J. G. [2 ]
Lin, Z. W. [2 ]
机构
[1] Univ Wollongong, Spintron & Elect Mat Grp, Inst Superconducting & Elect Mat, Wollongong, NSW 2522, Australia
[2] Univ Technol Sydney, Fac Engn, Sydney, NSW 2007, Australia
基金
澳大利亚研究理事会;
关键词
D O I
10.1063/1.2837624
中图分类号
O59 [应用物理学];
学科分类号
摘要
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 T-N 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. (c) 2008 American Institute of Physics.
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页数:3
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