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Journal Article

Heat conductivity and thermopower of Nd1-xSrxCoO3 ceramic

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Gmelin,  E.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Morchshakov, V., Haupt, L., Bärner, K., Troyanchuk, I. O., Rao, G. H., Ghoshray, A., et al. (2004). Heat conductivity and thermopower of Nd1-xSrxCoO3 ceramic. Journal of Alloys and Compounds, 372(1-2), 17-24.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FE60-8
Abstract
Nd1-xSrxCoO3 polycrystals have been prepared in the compositional range
0 < x < 0.5. Magnetisation, resistivity, thermoelectric power (TEP) and
heat conductivity have been measured. Metallic conduction (drho/dT > 0)
is observed for x > 0.4. All other compounds show activated behaviour:
drho/dT < 0. A higher order transition is observed in the heat
conductivity kappa(T) and the thermopower S(T) of the base compound
around T-s = 200 K which gradually smoothens out with increasing
Sr-content. Specifically, we propose a low spin-low spin approach
transition which involves phonons in a way similar to the dynamic
Jahn-Teller effect. (C) 2003 Elsevier B.V. All rights reserved.