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.

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Cited by in corpus (4)

• Higher-order epitaxy: A pathway to suppressing structural instability and emergent superconductivity
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• Superconducting PdTe Thin Film Via Topotactic Transformation, Toward Topological Superconductors
• Reversible tuning of magnetic order and intrinsic superconductivity in strained FeTe films via stoichiometry control