Giant thermoelectric power factor in ultrathin FeSe superconductor

Sunao Shimizu, Junichi Shiogai, Nayuta Takemori, Shiro Sakai, Hiroaki Ikeda, Ryotaro Arita, Tsutomu Nojima, Atsushi Tsukazaki, Yoshihiro Iwasa

Research output: Contribution to journalArticle

2 Citations (Scopus)

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-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.

Original languageEnglish
Article number825
Pages (from-to)825
JournalNature communications
Volume10
Issue number1
DOIs
Publication statusPublished - Feb 18 2019
Externally publishedYes

Fingerprint

Thermoelectric power
Thermoelectricity
Superconducting materials
energy technology
Seebeck effect
Phonons
emerging
Electric Conductivity
superconductivity
Seebeck coefficient
Nanostructures
Transition Temperature
Ultrathin films
Energy harvesting
transition temperature
Superconductivity
Nanostructured materials
electrical resistivity
room temperature
Technology

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Shimizu, S., Shiogai, J., Takemori, N., Sakai, S., Ikeda, H., Arita, R., ... Iwasa, Y. (2019). Giant thermoelectric power factor in ultrathin FeSe superconductor. Nature communications, 10(1), 825. [825]. https://doi.org/10.1038/s41467-019-08784-z

Giant thermoelectric power factor in ultrathin FeSe superconductor. / Shimizu, Sunao; Shiogai, Junichi; Takemori, Nayuta; Sakai, Shiro; Ikeda, Hiroaki; Arita, Ryotaro; Nojima, Tsutomu; Tsukazaki, Atsushi; Iwasa, Yoshihiro.

In: Nature communications, Vol. 10, No. 1, 825, 18.02.2019, p. 825.

Research output: Contribution to journalArticle

Shimizu, S, Shiogai, J, Takemori, N, Sakai, S, Ikeda, H, Arita, R, Nojima, T, Tsukazaki, A & Iwasa, Y 2019, 'Giant thermoelectric power factor in ultrathin FeSe superconductor', Nature communications, vol. 10, no. 1, 825, pp. 825. https://doi.org/10.1038/s41467-019-08784-z
Shimizu, Sunao ; Shiogai, Junichi ; Takemori, Nayuta ; Sakai, Shiro ; Ikeda, Hiroaki ; Arita, Ryotaro ; Nojima, Tsutomu ; Tsukazaki, Atsushi ; Iwasa, Yoshihiro. / Giant thermoelectric power factor in ultrathin FeSe superconductor. In: Nature communications. 2019 ; Vol. 10, No. 1. pp. 825.
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