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We performed low-frequency ac first- and second-harmonic resistance measurements and dc I − V measurements on bulk FeSe crystals in a temperature range between 1.8 and 150 K and in mag- netic field up to 14 T. We observed considerable second-harmonic resistance, indicative of nonre- ciprocal charge transport, in some samples. By examining correlation between contact resistances and second-harmonic signals, we concluded that the second-harmonic resistance was not due to the genuine nonreciprocal transport effect but was caused by joule heating at a current contact through the thermoelectric effect. Our conclusion is consistent with a recent preprint (Nagata et al., arXiv:2409.01715), in which the authors reported a zero-field superconducting diode effect in devices fabricated with FeSe flakes and attributed it to the thermoelectric effect.

権利情報:

• In Copyright
  ©2025 American Physical Society

キーワード: nonreciprocal transport, iron-based superconductor, FeSe

刊行年月日: 2025-02-21

出版者: American Physical Society (APS)

掲載誌:

• Physical Review B (ISSN: 1550235X) vol. 111 issue. 5 054521

研究助成金:

• Japan Society for the Promotion of Science JP19H05824
• Japan Society for the Promotion of Science JP22H04485
• Japan Society for the Promotion of Science JP21H04443
• Japan Society for the Promotion of Science JP22H00105
• Japan Society for the Promotion of Science JP23H00089
• Japan Society for the Promotion of Science JP22H01173
• Japan Society for the Promotion of Science JP22KK0036
• Ministry of Education, Culture, Sports, Science and Technology

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5343

公開URL: https://doi.org/10.1103/PhysRevB.111.054521

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更新時刻: 2025-02-26 12:30:21 +0900

MDRでの公開時刻: 2025-02-26 12:30:22 +0900