Cargando…

Magnetic anisotropy in Shiba bound states across a quantum phase transition

The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of...

Descripción completa

Detalles Bibliográficos
Autores principales: Hatter, Nino, Heinrich, Benjamin W., Ruby, Michael, Pascual, Jose I., Franke, Katharina J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Pub. Group 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674822/
https://www.ncbi.nlm.nih.gov/pubmed/26603561
http://dx.doi.org/10.1038/ncomms9988
_version_ 1782404955486814208
author Hatter, Nino
Heinrich, Benjamin W.
Ruby, Michael
Pascual, Jose I.
Franke, Katharina J.
author_facet Hatter, Nino
Heinrich, Benjamin W.
Ruby, Michael
Pascual, Jose I.
Franke, Katharina J.
author_sort Hatter, Nino
collection PubMed
description The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of the paired superconducting quasiparticles. Here we use scanning tunnelling spectroscopy to identify the different quantum ground states of manganese phthalocyanine on Pb(111). We observe Shiba states, which are split into triplets by magnetocrystalline anisotropy. Their characteristic spectral weight yields an unambiguous proof of the nature of the quantum ground state. Our results provide experimental insights into the phase diagram of a magnetic impurity on a superconducting host and shine light on the effects induced by magnetic anisotropy on many-body interactions.
format Online
Article
Text
id pubmed-4674822
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Nature Pub. Group
record_format MEDLINE/PubMed
spelling pubmed-46748222015-12-21 Magnetic anisotropy in Shiba bound states across a quantum phase transition Hatter, Nino Heinrich, Benjamin W. Ruby, Michael Pascual, Jose I. Franke, Katharina J. Nat Commun Article The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of the paired superconducting quasiparticles. Here we use scanning tunnelling spectroscopy to identify the different quantum ground states of manganese phthalocyanine on Pb(111). We observe Shiba states, which are split into triplets by magnetocrystalline anisotropy. Their characteristic spectral weight yields an unambiguous proof of the nature of the quantum ground state. Our results provide experimental insights into the phase diagram of a magnetic impurity on a superconducting host and shine light on the effects induced by magnetic anisotropy on many-body interactions. Nature Pub. Group 2015-11-25 /pmc/articles/PMC4674822/ /pubmed/26603561 http://dx.doi.org/10.1038/ncomms9988 Text en Copyright © 2015, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Hatter, Nino
Heinrich, Benjamin W.
Ruby, Michael
Pascual, Jose I.
Franke, Katharina J.
Magnetic anisotropy in Shiba bound states across a quantum phase transition
title Magnetic anisotropy in Shiba bound states across a quantum phase transition
title_full Magnetic anisotropy in Shiba bound states across a quantum phase transition
title_fullStr Magnetic anisotropy in Shiba bound states across a quantum phase transition
title_full_unstemmed Magnetic anisotropy in Shiba bound states across a quantum phase transition
title_short Magnetic anisotropy in Shiba bound states across a quantum phase transition
title_sort magnetic anisotropy in shiba bound states across a quantum phase transition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4674822/
https://www.ncbi.nlm.nih.gov/pubmed/26603561
http://dx.doi.org/10.1038/ncomms9988
work_keys_str_mv AT hatternino magneticanisotropyinshibaboundstatesacrossaquantumphasetransition
AT heinrichbenjaminw magneticanisotropyinshibaboundstatesacrossaquantumphasetransition
AT rubymichael magneticanisotropyinshibaboundstatesacrossaquantumphasetransition
AT pascualjosei magneticanisotropyinshibaboundstatesacrossaquantumphasetransition
AT frankekatharinaj magneticanisotropyinshibaboundstatesacrossaquantumphasetransition