Anisotropic transport and magnetic properties of Pr_(1/2)Sr_(1/2)MnO_3 single crystal sample

摘要

Resistivity and magnetization for Pr_(1/2)Sr_(1/2)MnO_3 single crystal samples were measured in the directions of parallel (∥) and perpendicular (⊥) to the ferromagnetic (FM) plane. The observed anisotropic transport and magnetic properties in antiferromagnetic (AFM) and FM states can be explained by the double exchange model with d_(x2-y2) orbital structure: with the anisotropic orbital structure, carriers in the FM state or AFM state move only in the FM layers and show two-dimensional metallic behavior. As the A-type AFM state undergoes a transition to a canted spin state below T_N, it also shows spin-flop transition at T < T_N.