Colossal thermoelectric power in Gd-Sr manganites

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 Gd0.5Sr...

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Published inEurophysics letters Vol. 91; no. 1; pp. 17008 - 17011
Main Authors Sagar, S, Ganesan, V, Joy, P. A, Thomas, Senoy, Liebig, A, Albrecht, M, Anantharaman, M. R
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.07.2010
EDP Sciences
Subjects
72.20.-i
72.20.Pa
75.47.Lx
Manganites
Phase transformations
Power measurements
Thermoelectricity
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Summary: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.
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ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/91/17008