Volume 91, Number 1, July 2010
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 July 2010|
Colossal thermoelectric power in Gd-Sr manganites
Department of Physics, Cochin University of Science and Technology - Cochin-22, India
2 Low temperature division, UGC-DAE Consortium for Scientific Research - Indore, India
3 Physical & Materials Chemistry Division, National Chemical Laboratory - Pune 411008, India
4 Institute of Physics, Chemnitz University of Technology - D-09107 Chemnitz, Germany, EU
Accepted: 1 July 2010
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. Temperature-dependent magnetisation measurements showed that the samples 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.
PACS: 75.47.Lx – Magnetic oxides / 72.20.Pa – Thermoelectric and thermomagnetic effects / 72.20.-i – Conductivity phenomena in semiconductors and insulators
© EPLA, 2010
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