Local Investigation of Single Magnetic Molecules with Scanning Tunneling Microscopy
Local Investigation of Single Magnetic Molecules with Scanning Tunneling Microscopy

Author: Chen, Jinjie

Publisher: KIT Scientific Publishing

Published: 2019-01-18

Total Pages: 146

ISBN-13: 3731508192

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We worked on different magnetic molecules containing 3d and 4f magnetic centers. Their growth on metallic surfaces, topographies, spin states, magnetic properties and electron transport were locally investigated by using scanning tunneling microscopy (STM) at temperatures down to 30mK. The main achievement of this dissertation reveals the abrupt switching of crystal fields during formation of molecular contacts.

Investigation of Magnetic Adatoms with Scanning Tunneling Techniques
Investigation of Magnetic Adatoms with Scanning Tunneling Techniques

Author: Maerkl, Junji Tobias

Publisher: KIT Scientific Publishing

Published: 2016-01-20

Total Pages: 114

ISBN-13: 3731504359

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In this work, magnetic atoms on surfaces are studied with low-temperature scanning tunneling microscopy. Motivated by the idea to use single atoms as magnetic bits, the factors that allow or prevent long-term stability of their magnetic moments are investigated. Lifetimes of up to several minutes can be achieved for the magnetic moments of holmium atoms on a Pt(111) surface, resulting from the combined symmetries of the system. Corresponding theoretical calculations are presented and evaluated.

Light Emission from Single Self-decoupled Molecules in a Scanning Tunnelling Microscope
Light Emission from Single Self-decoupled Molecules in a Scanning Tunnelling Microscope

Author: Rai, Vibhuti Narayan

Publisher: KIT Scientific Publishing

Published: 2022-10-04

Total Pages: 150

ISBN-13: 3731512017

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In this work, a clear pathway is presented to achieve well-defined electronically decoupled chromophores from metallic leads without requiring additional insulating layers. To study such self-decoupled molecules, STM equipped with an efficient light detection setup has been used. Results show that the chromophores mounted on tripodal molecular platforms adsorbed on a gold surface present well-defined and efficient electroluminescence down to the single-molecule level.

Molecular Motor Based on Single Chiral Tripodal Molecules Studied with STM
Molecular Motor Based on Single Chiral Tripodal Molecules Studied with STM

Author: Skolaut, Julian

Publisher: KIT Scientific Publishing

Published: 2023-09-14

Total Pages: 164

ISBN-13: 3731512475

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This work presents a single molecular motor driven by the current in an STM. Its chiral functional group is supposed to perform a rotation in a preferred direction, proven by Binomial tests to be statistically significant. The rotation is proposedly driven by the chiral-induced spin selectivity effect (CISS). However, the studies of the rotation on the dependence on the lateral tip position, voltage and current indicate that he CISS is unlikely to cause the preferred rotation direction.

Elastic and Inelastic Scanning Tunneling Spectroscopy on Iron-Based Superconductors
Elastic and Inelastic Scanning Tunneling Spectroscopy on Iron-Based Superconductors

Author: Jandke, Jasmin Maria

Publisher: KIT Scientific Publishing

Published: 2019-05-02

Total Pages: 242

ISBN-13: 3731507471

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Within this work, the pairing mechanism of conventional (Pb) and unconventional superconductors (SrFe2(As1-xPx )2 , FeSe, FeSe/STO) was investigated experimentally by means of elastic and inelastic tunneling spectroscopy at temperatures down to 30 mK. The distinction between elastic and inelastic contributions to tunneling data was elaborated. The results help to identify conventional (phonon-mediated) and unconventional (e.g. spin-?uctuation mediated) superconductivity.

Local Probing of a Superconductor’s Quasiparticles and Bosonic Excitations with a Scanning Tunnelling Microscope
Local Probing of a Superconductor’s Quasiparticles and Bosonic Excitations with a Scanning Tunnelling Microscope

Author: Gozlinski, Thomas

Publisher: KIT Scientific Publishing

Published: 2023-03-24

Total Pages: 208

ISBN-13: 3731512793

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Complementary to scattering techniques, scanning tunnelling microscopy provides atomic-scale real space information about a material's electronic state of matter. State-of-the-art designs of a scanning tunnelling microscope (STM) allow measurements at millikelvin temperatures with unprecedented energy resolution. Therefore, this instrument excels in probing the superconducting state at low temperatures and especially its local quasiparticle excitations as well as bosonic degrees of freedom.

Schackert, Michael PeterScanning Tunneling Spectroscopy on Electron-Boson Interactions in Superconductors
Schackert, Michael PeterScanning Tunneling Spectroscopy on Electron-Boson Interactions in Superconductors

Author: Schackert, Michael Peter

Publisher: KIT Scientific Publishing

Published: 2015-03-23

Total Pages: 148

ISBN-13: 3731502380

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This work describes the experimental study of electron-boson interactions in superconductors by means of inelastic electron tunneling spectroscopy performed with a scanning tunneling microscope (STM) at temperatures below 1 K. This new approach allows the direct measurement of the Eliashberg function of conventional superconductors as demonstrated on lead (Pb) and niobium (Nb). Preparative experiments on unconventional iron-pnictides are presented in the end.