Stoichiometric FeTe is a Superconductor
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2026
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| author | Yan, Zi-Jie Wang, Zihao Xia, Bing Paolini, Stephen Chan, Ying-Ting Dihingia, Nikalabh Rong, Hongtao Xiao, Pu Halanayake, Kalana D. Song, Jiatao Gowda, Veer Hickey, Danielle Reifsnyder Wu, Weida Yu, Jiabin Hirschfeld, Peter J. Chang, Cui-Zu |
| author_facet | Yan, Zi-Jie Wang, Zihao Xia, Bing Paolini, Stephen Chan, Ying-Ting Dihingia, Nikalabh Rong, Hongtao Xiao, Pu Halanayake, Kalana D. Song, Jiatao Gowda, Veer Hickey, Danielle Reifsnyder Wu, Weida Yu, Jiabin Hirschfeld, Peter J. Chang, Cui-Zu |
| contents | Iron-based superconductors are a fascinating family of materials in which multiple electronic bands and strong antiferromagnetic (AFM) correlations are key ingredients for competing ground states, including antiferromagnetism, electronic nematicity, and unconventional superconductivity. FeTe, unlike its superconducting isostructural counterpart FeSe, has long been regarded as an AFM metal sans superconductivity. In this work, we employ molecular beam epitaxy to grow FeTe films and perform post-growth annealing under a Te flux. By performing spin-polarized scanning tunneling microscopy and spectroscopy, we demonstrate that the AFM order in as-grown FeTe films is induced by interstitial Fe atoms that disrupt the ideal 1:1 stoichiometry. Remarkably, the removal of these interstitial Fe atoms through Te annealing yields stoichiometric FeTe films that show no AFM order and instead exhibit robust superconductivity with a critical temperature of ~13.5K. This superconducting state is further confirmed by the observation of Cooper pair tunneling, zero electrical resistance, and the Meissner effect. Therefore, our results demonstrate that stoichiometric FeTe is inherently a superconductor, overturning a long-held view that it is an AFM metal. This work clarifies the origin of superconductivity in FeTe-based heterostructures and demonstrates the importance of stoichiometry control in understanding the competition between AFM and superconductivity in iron-based superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_16115 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Stoichiometric FeTe is a Superconductor Yan, Zi-Jie Wang, Zihao Xia, Bing Paolini, Stephen Chan, Ying-Ting Dihingia, Nikalabh Rong, Hongtao Xiao, Pu Halanayake, Kalana D. Song, Jiatao Gowda, Veer Hickey, Danielle Reifsnyder Wu, Weida Yu, Jiabin Hirschfeld, Peter J. Chang, Cui-Zu Superconductivity Mesoscale and Nanoscale Physics Materials Science Iron-based superconductors are a fascinating family of materials in which multiple electronic bands and strong antiferromagnetic (AFM) correlations are key ingredients for competing ground states, including antiferromagnetism, electronic nematicity, and unconventional superconductivity. FeTe, unlike its superconducting isostructural counterpart FeSe, has long been regarded as an AFM metal sans superconductivity. In this work, we employ molecular beam epitaxy to grow FeTe films and perform post-growth annealing under a Te flux. By performing spin-polarized scanning tunneling microscopy and spectroscopy, we demonstrate that the AFM order in as-grown FeTe films is induced by interstitial Fe atoms that disrupt the ideal 1:1 stoichiometry. Remarkably, the removal of these interstitial Fe atoms through Te annealing yields stoichiometric FeTe films that show no AFM order and instead exhibit robust superconductivity with a critical temperature of ~13.5K. This superconducting state is further confirmed by the observation of Cooper pair tunneling, zero electrical resistance, and the Meissner effect. Therefore, our results demonstrate that stoichiometric FeTe is inherently a superconductor, overturning a long-held view that it is an AFM metal. This work clarifies the origin of superconductivity in FeTe-based heterostructures and demonstrates the importance of stoichiometry control in understanding the competition between AFM and superconductivity in iron-based superconductors. |
| title | Stoichiometric FeTe is a Superconductor |
| topic | Superconductivity Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2603.16115 |