Universität zu Köln

Zonda, Martin ORCID: 0000-0002-8513-3392, Stetsovych, Oleksandr, Korytar, Richard, Ternes, Markus ORCID: 0000-0001-6800-4129, Temirov, Ruslan ORCID: 0000-0001-8290-6831, Raccanelli, Andrea, Tautz, F. Stefan, Jelinek, Pavel, Novotny, Tomas and Svec, Martin (2021). Resolving Ambiguity of the Kondo Temperature Determination in Mechanically Tunable Single-Molecule Kondo Systems. J. Phys. Chem. Lett., 12 (27). S. 6320 - 6326. WASHINGTON: AMER CHEMICAL SOC. ISSN 1948-7185

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Abstract

Determination of the molecular Kondo temperature (T-K) poses a challenge in most cases when the experimental temperature cannot be tuned to a sufficient extent. We show how this ambiguity can be resolved if additional control parameters are present, such as magnetic field and mechanical gating. We record the evolution of the differential conductance by lifting an individual molecule from the metal surface with the tip of a scanning tunneling microscope. By fitting the measured conductance spectra with the single impurity Anderson model we are able to demonstrate that the lifting tunes the junction continuously from the strongly correlated Kondosinglet to the free spin-1/2 ground state. In the crossover regime, where T-K is similar to the temperature of experiment, the fitting yields ambiguous estimates of T-K varying by an order of magnitude. We show that analysis of the conductance measured in two distinct external magnetic fields can be used to resolve this problem.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zonda, Martin UNSPECIFIED orcid.org/0000-0002-8513-3392 UNSPECIFIED Stetsovych, Oleksandr UNSPECIFIED UNSPECIFIED UNSPECIFIED Korytar, Richard UNSPECIFIED UNSPECIFIED UNSPECIFIED Ternes, Markus UNSPECIFIED orcid.org/0000-0001-6800-4129 UNSPECIFIED Temirov, Ruslan UNSPECIFIED orcid.org/0000-0001-8290-6831 UNSPECIFIED Raccanelli, Andrea UNSPECIFIED UNSPECIFIED UNSPECIFIED Tautz, F. Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Jelinek, Pavel UNSPECIFIED UNSPECIFIED UNSPECIFIED Novotny, Tomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Svec, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-598144
DOI:	10.1021/acs.jpclett.1c01544
Journal or Publication Title:	J. Phys. Chem. Lett.
Volume:	12
Number:	27
Page Range:	S. 6320 - 6326
Date:	2021
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1948-7185
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MAGNETIC-ANISOTROPY; ANDERSON MODEL; SPECTROSCOPY; SCATTERING Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/59814