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We have investigated magnetization(M), magnetocaloric effect(MCE) andmagnetothermopower(MTEP) in polycrystalline Pr0.6Sr0.4MnO3, which shows asecond-order paramagnetic to ferromagnetic transition near room temperature (TC= 305 K). However, field-cooled M(T) within the long range ferromagnetic stateshows an abrupt decrease at TS = 86 K for H < 3 T. The low temperaturetransition is first-order in nature as suggested by the hysteresis in M(T) andexothermic/endothermic peaks in differential thermal analysis for cooling andwarming cycles. The anomaly at TS is attributed to a structural transition fromorthorhombic to monoclinic phase. The magnetic entropy change is negative at TCbut changes to positive at TS. Thermopower (Q) is negative from 350 K to 20 K,shows a rapid decrease at TC and a small cusp around TS in zero field. The MTEPreaches a maximum value of 25% for deltaH = 3 T around TC which is much higherthan 15% dc magnetoresistance for the same field change. A linear relationbetween MTEP and magnetoresistance, and between delta Sm and Delta Q are foundnear TC. Further, ac magnetotransport in low dc magnetic fields (H less than orequal to 1 kOe), critical analysis of the paramagnetic to ferromagnetictransition and scaling behavior of the magnetic entropy change versus a reducedtemperature under different magnetic fields are also reported.

Magnetocaloric effect and Magnetothermopower in the room temperature ferromagnet Pr0.6Sr0.4MnO3