A possible superconducting gap signature with filling temperature around 40 K in hexagonal iron telluride islands

Guanyang He; Yuxuan Lei; Tianheng Wei; Yanzhao Liu; Jian Wang

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arXiv · 2603.21959

A possible superconducting gap signature with filling temperature around 40 K in hexagonal iron telluride islands

Guanyang He·Yuxuan Lei·Tianheng Wei·Yanzhao Liu·Jian Wang

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Abstract

Superconductivity in the iron-chalcogenide series FeSe-Fe(Te, Se)-FeTe has been restricted to the near neighbor of iron selenide (FeSe), with a general consensus that iron telluride (FeTe) is not superconducting. In this study, we report the method to grow FeTe islands with atomically flat surface and hexagonal lattice on SrTiO3 (001) substrates, in which a gap structure with a gap-filling temperature close to 40 K is detected by scanning tunneling spectroscopy. Such signature is examined under various conditions and reminiscent of a superconducting gap structure. This work might offer a potential platform to explore new superconductors at ambient pressure.

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Guanyang He, Yuxuan Lei, Tianheng Wei, Yanzhao Liu, Jian Wang. 2026-03-23. A possible superconducting gap signature with filling temperature around 40 K in hexagonal iron telluride islands. https://arxiv.org/abs/2603.21959

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