Colossal thermoelectric power in Gd-Sr manganites

S. Sagar, V. Ganesan, P. A. Joy, Senoy Thomas, A. Liebig, M. Albrecht, M. R. Anantharaman
2010 Europhysics letters  
Manganites belonging to the series Gd1−xSrxMnO3 (x = 0.3, 0.4 and 0.5) were prepared by wet solid-state reaction and their thermoelectric power was evaluated. Thermoelectric power measurements revealed a peak value at ∼40 K. All the samples exhibited a colossal thermopower at ∼40 K and in that Gd0.5Sr0.5MnO3 exhibited a maximum value of ∼35 mV/K, which is the largest reported for these class of materials at this temperature. Temperaturedependent magnetisation measurements showed that the
more » ... exhibit a phase transition from paramagnetic to spin-glass-like state at these temperatures. Plausible mechanisms responsible for the observed colossal thermoelectric power in Gd-Sr manganites are discussed.
doi:10.1209/0295-5075/91/17008 fatcat:tmisibo6nfcxbjbpbsebpskol4