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Closing the superconducting gap in small Pb nanoislands with high magnetic fields

MPS-Authors
/persons/resource/persons140803

Burgess,  J. A. J.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany;

/persons/resource/persons133866

Yan,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany;

/persons/resource/persons133858

Loth,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany;

/persons/resource/persons133864

Rolf-Pissarczyk,  S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research, Heisenbergstraße 1, 70569 Stuttgart, Germany;

External Ressource
Fulltext (public)

PhysRevB.94.224504.pdf
(Publisher version), 2MB

Supplementary Material (public)

SM3.pdf
(Supplementary material), 812KB

Citation

Burgess, J. A. J., Yan, S., Loth, S., & Rolf-Pissarczyk, S. (2016). Closing the superconducting gap in small Pb nanoislands with high magnetic fields. Physical Review B, 94(22): 224504. doi:10.1103/PhysRevB.94.224504.


Cite as: http://hdl.handle.net/21.11116/0000-0001-8CB6-4
Abstract
Superconducting properties change in confined geometries. Here we study the effects of strong confinement in nanosized Pb islands on Si(111) 7×7. Small hexagonal islands with diameters less than 50 nm and a uniform height of seven atomic layers are formed by depositing Pb at low temperature and annealing at 300 K. We measure the tunneling spectra of individual Pb nanoislands using a low-temperature scanning tunneling microscope operated at 0.6 K and follow the narrowing of the superconducting gap as a function of magnetic field. We find the critical magnetic field, at which the superconducting gap vanishes, reaches several Tesla, which represents a greater than 50-fold enhancement compared to the bulk value. By independently measuring the size of the superconducting gap, and the critical magnetic field that quenches superconductivity for a range of nanoislands, we can correlate these two fundamental parameters and estimate the maximal achievable critical field for 7 ML Pb nanoislands to be 7 T.