Universal Superconductivity in FeTe and All-Iron-Based Ferromagnetic Superconductor Heterostructures
Abstract
Ferromagnetism (FM) and superconductivity (SC) are two of the most famous macroscopic quantum phenomena. However, nature normally does not allow SC and FM to coexist without significant degradation. Here, we introduce the first fully iron-based SC/FM heterostructures, composed of Fe(Te,Se) and Fe3GeTe2, and show that in this platform strong FM and high-temperature SC robustly coexist. We subsequently discover that chemical proximity effect from neighboring layers can universally drive the otherwise non-superconducting FeTe films into a SC state. This suggests that the ground state of FeTe is so close to the SC state that it could be driven in and out of the SC state with various other perturbations. Altogether, this shows that Fe-Te-based heterostructures provide a unique opportunity to manipulate magnetism, superconductivity and topological physics, paving the way toward new superconducting technologies.
Cite
@article{arxiv.2502.01838,
title = {Universal Superconductivity in FeTe and All-Iron-Based Ferromagnetic Superconductor Heterostructures},
author = {Hee Taek Yi and Xiong Yao and Deepti Jain and Ying-Ting Chan and An-Hsi Chen and Matthew Brahlek and Kim Kisslinger and Kai Du and Myung-Geun Han and Yimei Zhu and Weida Wu and Sang-Wook Cheong and Seongshik Oh},
journal= {arXiv preprint arXiv:2502.01838},
year = {2025}
}