Magnetoresistance in Parent Pnictide AFe2As2(A=Sr, Ba)

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2009,（10）
• 页码范围: 163-166
• 页数: 4页
• 语种: 英文

摘要

Magnetoresistances of SrFe2 As2 and BaFe2 As2 in the magnetic ordered state are studied.Positive magnetoresis-tance is observed in the magnetic fields H applied in the azimuthes foθ = 0°and 30°with respect to the c-axis.The magnetoresistance can reach 20% for SrFe2 As2 and 12% for BaFe2As2 at H = 9 T with θ= 0°(H||c).Above the magnetic transition temperature, the magnetoresistance becomes negligible.The data in the magnetic ordered state could be described by a modified two-band galvanomagnetic model including the enhancement effect of the applied magnetic field on the spin-density-wave gap.The field enhanced spin-density-wave gaps for different types of carriers are different.Temperature dependencies of the fitting parameters are discussed.