Apparent nonreciprocal transport in FeSe bulk crystals
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866916625334140928 |
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| author | Terashima, Taichi Uji, Shinya Matsuda, Yuji Shibauchi, Takasada Kasahara, Shigeru |
| author_facet | Terashima, Taichi Uji, Shinya Matsuda, Yuji Shibauchi, Takasada Kasahara, Shigeru |
| contents | 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 magnetic field up to 14 T. We observed considerable second-harmonic resistance, indicative of nonreciprocal 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 \textit{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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08928 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Apparent nonreciprocal transport in FeSe bulk crystals Terashima, Taichi Uji, Shinya Matsuda, Yuji Shibauchi, Takasada Kasahara, Shigeru Superconductivity Materials Science 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 magnetic field up to 14 T. We observed considerable second-harmonic resistance, indicative of nonreciprocal 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 \textit{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. |
| title | Apparent nonreciprocal transport in FeSe bulk crystals |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2502.08928 |