The transport properties of Pr1.2Sr1.8Mn2O7 and Pr1Sr2Mn2O7 under pressure.

This paper reports the electronic transport measurements of the single crystal Pr1.2Sr1.8Mn2O7 and Pr1Sr2Mn2O7 under pressure. The measurements in the ab plane for Pr1.2Sr1.8Mn2O7 show that the pressure induces a phase transition from a semiconducting state to a metallic state at 0.5 GPa, and then the transition temperature decreases rapidly with increasing pressure, indicating the pressure favors the paramagnetic semiconducting state and suppresses the ferromagnetic metallic state after the occurring of the transition. Moreover, for Pr1Sr2Mn2O7, the semiconducting-metallic state transition occurs at ambient pressure and the pressure favors the paramagnetic semiconducting state and suppresses the antiferromagnetic metallic state. [ABSTRACT FROM AUTHOR]