Vacancy defect control of colossal thermopower in FeSb2

Qianheng Du, Lijun Wu, Huibo Cao, Chang Jong Kang, Christie Nelson, Gheorghe Lucian Pascut, Tiglet Besara, Theo Siegrist, Kristjan Haule, Gabriel Kotliar, Igor Zaliznyak, Yimei Zhu, Cedomir Petrovic

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Iron diantimonide is a material with the highest known thermoelectric power. By combining scanning transmission electron microscopic study with electronic transport neutron, X-ray scattering, and first principle calculation, we identify atomic defects that control colossal thermopower magnitude and nanoprecipitate clusters with Sb vacancy ordering, which induce additional phonon scattering and substantially reduce thermal conductivity. Defects are found to cause rather weak but important monoclinic distortion of the unit cell Pnnm → Pm. The absence of Sb along [010] for high defect concentration forms conducting path due to Fe d orbital overlap. The connection between atomic defect anisotropy and colossal thermopower in FeSb2 paves the way for the understanding and tailoring of giant thermopower in related materials.

Original languageEnglish (US)
Article number13
Journalnpj Quantum Materials
Volume6
Issue number1
DOIs
StatePublished - Dec 2021

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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