Work

Thermopower Enhancement from Engineering the Na0.7CoO2 Interacting Fermiology via Fe Doping

Year: 2018

Type: article

Abstract: The sodium cobaltate system Nax Co O2 is a prominent representant of strongly correlated materials with promising thermoelectric response. In a combined theoretical and experimental study we show that, by doping the Co site of the compound at x=0.7 with iron, a further increase of the Seebeck coefficient is achieved. The Fe defects give rise to effective hole doping in the high-thermopower region of larger sodium content x . Originally filled hole pockets in the angular-resolved spectral function of the material shift to low energy when introducing Fe, leading to a multisheet interacting Fermi surface. Because of the higher sensitivity of correlated materials to doping, introducing adequate substitutional defects is thus a promising route to manipulate their thermopower.

Source: Advances in Condensed Matter Physics

DOI: 10.1155/2018/9725321

Authors: Raphael Richter, Denitsa Shopova, Wenjie Xie, Anke Weidenkaff, Frank Lechermann

Institutions: Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), University of Stuttgart, Universität Hamburg

Language: English

Topic: Advanced Thermoelectric Materials and Devices

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: gold

Estimated APC paid: $1,630