Half-metallic perovskite superlattices with colossal thermoelectric figure of merit

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

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

  • Publication Type: Article / Article
  • Volume: 1 Issue: 29
  • Publication Date: 2013
  • Doi Number: 10.1039/c3ta11346a
  • Journal Name: JOURNAL OF MATERIALS CHEMISTRY A
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.8406-8410
  • Yıldız Technical University Affiliated: Yes

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.