From a wide band gap to the superconducting proximity effect: Fe on Pb(111)

M. Omidian; J. Brand; N. Néel; S. Crampin; J. Kröger

doi:10.1088/1367-2630/acc607

From a wide band gap to the superconducting proximity effect: Fe on Pb(111)

M. Omidian
, J. Brand
, N. Néel
, S. Crampin
, J. Kröger

Technische Universität Ilmenau

Research output: Contribution to journal › Article › peer-review

Abstract

Epitaxially grown Fe nanostructures on Pb(111) were studied by low-temperature scanning tunneling microscopy and spectroscopy. The deposited Fe assemblies are classified into two groups according to their electronic behavior close to the Fermi energy. One group exhibits a wide energy gap of 0.7 eV that is independent of the temperature ranging from 5 K to room temperature. These Fe islands indicate the absence of the superconductivity proximity effect in their interior. The other group shows a metallic behavior at the Fermi level. The substrate superconducting phase locally enters into these islands, which is evidenced by a sharp resonance at the Fermi energy presumably signaling Andreev reflection at the magnet-superconductor interface.

Original language	English
Article number	033036
Number of pages	15
Journal	New Journal of Physics
Volume	25
Issue number	3
DOIs	https://doi.org/10.1088/1367-2630/acc607
Publication status	Published - 31 Mar 2023

Data Availability Statement

The data cannot be made publicly available upon publication because they are not available in a format that is sufficiently accessible or reusable by other researchers. The data that support the findings of this study are available upon reasonable request from the authors.

Funding

Funding by the Deutsche Forschungsgemeinschaft through KR 2912/10-3 and KR 2912/18-1, financial support by the German Federal Ministry of Education and Research within the ‘Forschungslabore Mikroelektronik Deutschland (ForLab)’ initiative, as well as discussions with S Heinze (University of Kiel) and D Wegner (University of Nijmegen) are acknowledged. This research made use of the Balena High Performance Computing (HPC) Service at the University of Bath.

Keywords

electronic structure
scanning tunneling microscopy
scanning tunneling spectroscopy
superconductivity

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1088/1367-2630/acc607Licence: CC BY

Cite this

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abstract = "Epitaxially grown Fe nanostructures on Pb(111) were studied by low-temperature scanning tunneling microscopy and spectroscopy. The deposited Fe assemblies are classified into two groups according to their electronic behavior close to the Fermi energy. One group exhibits a wide energy gap of 0.7 eV that is independent of the temperature ranging from 5 K to room temperature. These Fe islands indicate the absence of the superconductivity proximity effect in their interior. The other group shows a metallic behavior at the Fermi level. The substrate superconducting phase locally enters into these islands, which is evidenced by a sharp resonance at the Fermi energy presumably signaling Andreev reflection at the magnet-superconductor interface.",

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AU - Néel, N.

AU - Crampin, S.

AU - Kröger, J.

PY - 2023/3/31

Y1 - 2023/3/31

N2 - Epitaxially grown Fe nanostructures on Pb(111) were studied by low-temperature scanning tunneling microscopy and spectroscopy. The deposited Fe assemblies are classified into two groups according to their electronic behavior close to the Fermi energy. One group exhibits a wide energy gap of 0.7 eV that is independent of the temperature ranging from 5 K to room temperature. These Fe islands indicate the absence of the superconductivity proximity effect in their interior. The other group shows a metallic behavior at the Fermi level. The substrate superconducting phase locally enters into these islands, which is evidenced by a sharp resonance at the Fermi energy presumably signaling Andreev reflection at the magnet-superconductor interface.

AB - Epitaxially grown Fe nanostructures on Pb(111) were studied by low-temperature scanning tunneling microscopy and spectroscopy. The deposited Fe assemblies are classified into two groups according to their electronic behavior close to the Fermi energy. One group exhibits a wide energy gap of 0.7 eV that is independent of the temperature ranging from 5 K to room temperature. These Fe islands indicate the absence of the superconductivity proximity effect in their interior. The other group shows a metallic behavior at the Fermi level. The substrate superconducting phase locally enters into these islands, which is evidenced by a sharp resonance at the Fermi energy presumably signaling Andreev reflection at the magnet-superconductor interface.

KW - electronic structure

KW - scanning tunneling microscopy

KW - scanning tunneling spectroscopy

KW - superconductivity

UR - https://www.scopus.com/pages/publications/85152105684

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DO - 10.1088/1367-2630/acc607

M3 - Article

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VL - 25

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JF - New Journal of Physics

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ER -

From a wide band gap to the superconducting proximity effect: Fe on Pb(111)

Abstract

Data Availability Statement

Funding

Keywords

ASJC Scopus subject areas

Access to Document

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