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Evidence for giant spin entropy contribution in thermoelectric Ca3Co4O9+δ

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Abstract

We report magnetic field dependence of both in-plane and out-of plane thermopower in Ca3Co4O9+δ single crystal. Strong field dependence of both in-plane and out-of plane thermopower evinces giant spin entropy contribution to the thermopower in the thermoelectric material. These discovered effects indicate that spin entropy dominates the enhancement of thermopower in misfit-layered cobalt oxides materials. An obvious suppression of thermopower is stronger by an out-of-plane magnetic field than by an in-plane field.

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