SEARCH

SEARCH BY CITATION

Keywords:

  • magnetic fields;
  • transition-metal compounds;
  • thermoelectrics

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.