Impact of the iron substitution on the thermoelectric properties of Co 1− x Fe x S 2 ( x  ≤ 0.30)

Author:

Salas Ulises Acevedo1,Fourati Ismail2,Juraszek Jean2,Richomme Fabienne2,Pelloquin Denis1,Maignan Antoine1,Hébert Sylvie1

Affiliation:

1. Normandie université, ENSICAEN, UNICAEN, CNRS, CRISMAT UMR6508, 14000 Caen, France

2. Normandie université, UNIROUEN, INSA Rouen, CNRS, GPM UMR6634, 76000 Rouen, France

Abstract

The strong interplay between magnetism and transport can tune the thermoelectric properties in chalcogenides and oxides. In the case of ferromagnetic CoS 2 pyrite, it was previously shown that the power factor is large at room temperature, reaching 1 mW m −1  K −2 and abruptly increases for temperatures below the Curie transition ( T C ), an increase potentially due to a magnonic effect on the Seebeck ( S ) coefficient. The too large thermal conductivity approximately equal to 10.5 W m −1  K −1 at room temperature prevents this pyrite from being a good thermoelectric material. In this work, samples belonging to the Co 1− x Fe x S 2 pyrite family ( x  = 0, 0.15 and 0.30) have thus been investigated in order to modify the thermal properties by the introduction of disorder on the Co site. We show here that the thermal conductivity can indeed be reduced by such a substitution, but that this substitution predominantly induces a reduction of the electronic part of the thermal conductivity and not of the lattice part. Interestingly, the magnonic contribution to S below T C disappears as x increases, while at high T , S tends to a very similar value (close to −42 µV K −1 ) for all the samples investigated. This article is part of a discussion meeting issue ‘Energy materials for a low carbon future’.

Funder

Région Normandie

ANR Labex EMC3

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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