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

Authors

Gustavo A. Alvarez, University of WollongongFollow
Xiaolin Wang, University of WollongongFollow
Germanas Peleckis, University of WollongongFollow
S. X. Dou, University of WollongongFollow
Jian G. Zhu, University of Technology, Sydney
Zhi W. Lin, University of Technology, Sydney

RIS ID

26385

Publication Details

Alvarez, G. A., Wang, P., Peleckis, G., Dou, S. X., Zhu, J. G. and Lin, Z. W. (2008). Magnetotransport and magnetic properties of weak ferromagnetic semiconductors: Ca doped LaCrO3. Journal of Applied Physics, 103 (7), 07B916-1-07B916-3.

Abstract

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 com#163s 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.