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. 2024 Oct 2;15:8526. doi: 10.1038/s41467-024-52847-9

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© The Author(s) 2024

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License, which permits any non-commercial use, sharing, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if you modified the licensed material. You do not have permission under this licence to share adapted material derived from this article or parts of it. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by-nc-nd/4.0/.

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Fig. 1 — a Constant current image of Fe(Se,Te) with several interstitial excess Fe atoms (bright protrusions). V_set = 5 mV, I_set = 100 pA. b, c Differential conductance spectra taken at the excess Fe impurities marked 1 and 2 in panel a, respectively (setup resistance = 100 MΩ). Both show a multitude of peaks highlighting the multi-orbital nature of the Fe sites. The appearance of negative differential conductance in both spectra reflects interactions between sub-gap states. The gray spectrum is taken in between impurities 1 and 3 for comparison. d Junction resistance dependence of differential conductance on the Fe impurity marked 3 in panel a (dashed lines are guides to the eye). Upon lowering the setup resistance, the peaks shift closer to zero. Source data are provided as a Source Data file.