Giant thermoelectric power factor in ultrathin FeSe superconductor

Sunao Shimizu, Junichi Shiogai, Nayuta Takemori, Shiro Sakai, Hiroaki Ikeda, Ryotaro Arita, Tsutomu Nojima, Atsushi Tsukazaki and Yoshihiro Iwasa ()
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Sunao Shimizu: RIKEN Center for Emergent Matter Science (CEMS), Wako
Junichi Shiogai: Tohoku University
Nayuta Takemori: RIKEN Center for Emergent Matter Science (CEMS), Wako
Shiro Sakai: RIKEN Center for Emergent Matter Science (CEMS), Wako
Hiroaki Ikeda: Ritsumeikan University
Ryotaro Arita: RIKEN Center for Emergent Matter Science (CEMS), Wako
Tsutomu Nojima: Tohoku University
Atsushi Tsukazaki: Tohoku University
Yoshihiro Iwasa: RIKEN Center for Emergent Matter Science (CEMS), Wako

Nature Communications, 2019, vol. 10, issue 1, 1-7

Abstract: Abstract 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-Tc superconductor (Tc; superconducting transition temperature), exhibit superior thermoelectric responses. With decreasing thickness d, the electrical conductivity increases accompanying the emergence of high-Tc 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 Tc superconductors indicates the high potential of two-dimensional layered materials towards multi-functionalization.

Date: 2019
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DOI: 10.1038/s41467-019-08784-z

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