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Giant thermoelectric power factor in ultrathin FeSe superconductor

The thermoelectric effect is attracting a renewed interest as a concept for energy harvesting technologies. Nanomaterials have been considered a key to realize efficient thermoelectric conversions owing to the low dimensional charge and phonon transports. In this regard, recently emerging two-dimens...

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Bibliographic Details
Published in:Nature communications 2019-02, Vol.10 (1), p.825-825, Article 825
Main Authors: Shimizu, Sunao, Shiogai, Junichi, Takemori, Nayuta, Sakai, Shiro, Ikeda, Hiroaki, Arita, Ryotaro, Nojima, Tsutomu, Tsukazaki, Atsushi, Iwasa, Yoshihiro
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Language:English
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Summary:The thermoelectric effect is attracting a renewed interest as a concept for energy harvesting technologies. Nanomaterials have been considered a key to realize efficient thermoelectric conversions owing to the low dimensional charge and phonon transports. In this regard, recently emerging two-dimensional materials could be promising candidates with novel thermoelectric functionalities. Here we report that FeSe ultrathin films, a high- T c superconductor ( T c ; superconducting transition temperature), exhibit superior thermoelectric responses. With decreasing thickness d , the electrical conductivity increases accompanying the emergence of high- T c superconductivity; unexpectedly, the Seebeck coefficient α shows a concomitant increase as a result of the appearance of two-dimensional natures. When d is reduced down to ~1 nm, the thermoelectric power factor at 50 K and room temperature reach unprecedented values as high as 13,000 and 260 μW cm −1 K −2 , respectively. The large thermoelectric effect in high T c superconductors indicates the high potential of two-dimensional layered materials towards multi-functionalization. In an effort to optimize the performance of two-dimensional materials for thermoelectric generation, compounds with advantageous intrinsic properties must be identified. Here, the authors report large thermoelectric effect in ultrathin FeSe thin films with high T c superconductivity.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-019-08784-z