Half-metallic perovskite superlattices with colossal thermoelectric figure of merit


Kahaly M. U. , Ozdogan K. , Schwingenschloegl U.

JOURNAL OF MATERIALS CHEMISTRY A, vol.1, no.29, pp.8406-8410, 2013 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 1 Issue: 29
  • Publication Date: 2013
  • Doi Number: 10.1039/c3ta11346a
  • Title of Journal : JOURNAL OF MATERIALS CHEMISTRY A
  • Page Numbers: pp.8406-8410

Abstract

Nowadays heavy experimental efforts are focussed on doped oxide thermoelectrics to increase the thermopower and thermoelectric performance. We propose a high thermoelectric figure of merit for half-metallic SrTi1-xCoxO3 (x = 0, 0.125, 0.25, 0.375, and 0.5) in a superlattice with SrTiO3, which is stable at high temperatures and in an oxygen environment. The maximal value of Z hardly depends on the doping, while the temperature at which the maximum occurs increases with the Co concentration. The easy tunability from being an insulator to a half-metal under substitutional doping combined with the colossal figure of merit opens up great potential in the emerging field of spin-caloritronics.