Surface superconductivity emerged from disordered surface in undoped BaFe2As2
Quanxin Hu, Fazhi Yang, Xingyu Wang, Jiajun Li, Wenyao Liu, Lingyuan Kong, Shiliang Li, Lei Yan, Jinpeng Xu, Hong Ding
DOI 10.1103/PhysRevMaterials.7.034801 · Physical Review Materials
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Abstract
Among the iron-based superconductors, “122”-type compounds have been widely studied due to the availability of high-quality single crystals. However, due to lack of a natural cleavage plane, the cleaved surface is usually polarized, which allows doping change or structure modification on the surface. In this paper, we propose a simple method to successfully transform the 122-type parent compound BaFe2As2 to a superconductor via room-temperature relaxation or uniaxial strain. Using scanning tunneling microscopy/spectroscopy, we demonstrate that this superconductivity results directly from the disordered surface morphologies. Based on the transport results and the disappearance of superconductivity with every new cleave, we conclude that the superconductivity only manifests at the most superficial surface. Our finding opens up an unexpected way to achieve superconductivity in undoped BaFe2As2, other than chemical doping, which may offer an alternative channel to understand the iron-based superconductivity and its connection with disorders.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | onset |
| SrFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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