Magnetism and transport in Pr1-xSrxMnO3 single crystals (0.48≤x≤0.57)

The magnetic, electric, and thermal transport properties of the single-crystal Pr1-xSrxMnO3 perovskites have been investigated in the compositional region 0.48less than or equal toxless than or equal to0.57. The end compositions are characterized as ideal examples of the ferromagnetic (T-C=290 K) and the A-type antiferromagnetic (T-N=215 K) metals with a strong quadratic temperature dependence of the electrical resistivity below T-C (T-N), respectively. A transient behavior is observed on two intermediate samples with xcongruent to0.5, which are ferromagnetic below T-C=265 K and undergo a second transition to antiferromagnetism at T-N=125-155 K. Appreciable magnetoresistance effects in these samples below T-N are attributed to the field-induced antiferromagneticdouble right arrowferromagnetic phase transition. A detailed comparison of observed magnetothermal and magnetoelectrical conductivities justifies the application of Wiedemann-Franz law and points to an important role of electronic contribution in the thermal transport.