Changing the Interaction of a Single-Molecule Magnetic Moment with a Superconductor

The exchange interaction of a brominated Co-porphyrin molecule with the Cooper pair condensate of Pb(111) is modified by reducing the Co–surface separation. The stepwise dehalogenation and dephenylation change the Co adsorption height by a few picometers. Only the residual Co-porphine core exhibits...

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Bibliographic Details
Published in:	Nano letters Vol. 23; no. 4; pp. 1622 - 1628
Main Authors:	Schulte, Stefan, Néel, Nicolas, Rózsa, Levente, Palotás, Krisztián, Kröger, Jörg
Format:	Journal Article
Language:	English
Published:	United States American Chemical Society 22-02-2023
Subjects:	superconductivity Scanning tunneling microscopy and spectroscopy single-molecule chemical reaction Yu-Shiba-Rusinov bound state magnetic exchange interaction density functional theory
Online Access:	Get full text
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Summary:	The exchange interaction of a brominated Co-porphyrin molecule with the Cooper pair condensate of Pb(111) is modified by reducing the Co–surface separation. The stepwise dehalogenation and dephenylation change the Co adsorption height by a few picometers. Only the residual Co-porphine core exhibits a Yu-Shiba-Rusinov bound state with low binding energy in the Bardeen-Cooper-Schrieffer energy gap. Accompanying density functional calculations reveal that the Co d z 2 orbital carries the molecular magnetic moment and is responsible for the intragap state. The calculated spatial evolution of the Yu-Shiba-Rusinov wave function is compatible with the experimentally observed oscillatory attenuation of the electron–hole asymmetry with increasing lateral distance from the magnetic porphine center.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1530-6984 1530-6992
DOI:	10.1021/acs.nanolett.2c03952