Magnetotransport of proton-irradiated BaFe2As2 and BaFe1.985 Co0.015As2 single crystals

Abstract

Here we study the magnetotransport properties of the ferropnictide crystals BaFe2As2 and BaFe1.985 Co0.015As2. These materials exhibit a high field linear magnetoresistance that has been attributed to the quantum linear magnetoresistance model. In this model, the linear magnetoresistance is dependent on the concentration of scattering centers in the material. By using proton-beam irradiation to change the defect scattering density, we find that the dependence of the magnitude of the linear magnetoresistance on scattering quite clearly contravenes this prediction. A number of other scaling trends in the magnetoresistance and high field Hall data are observed and discussed.