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Scanning tunneling spectroscopy at the single atom scale

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Spin-fluctuation mediated superconductivity and magnetic order in the cuprate La1.88Sr0.12CuO4

High-temperature superconductivity in cuprates emerges as one out of many electronic phases when doping the antiferromagnetic Mott insulator La2CuO4 away from half lling. The description of the superconducting phase is therefore complicated by intertwined ...

University of Copenhagen2015

Measurement of the penetration depth and coherence length of MgB2 in all directions using transmission electron microscopy

Janusz Andrzej Karpinski

We demonstrate that images of flux vortices in a superconductor taken with a transmission electron microscope can be used to measure the penetration depth and coherence length in all directions at the same temperature and magnetic field. This is particular ...

Amer Physical Soc2015

Josephson Tunneling at the Atomic Scale

Berthold Jäck

The aim of this thesis is to characterize the properties of a Josephson junction in a Scanning Tunneling Microscope (STM) at millikelvin temperatures and to implement Josephson STM (JSTM) as a versatile probe at the atomic scale. To this end we investigate ...

EPFL2015

Intrinsic Josephson junctions in the iron-based multi-band superconductor (V 2 Sr 4 O 6 )Fe 2 As 2

Philip Johannes Walter Moll

In layered superconductors, Josephson junctions may be formed within the unit cell1,2,3 as a result of sufficiently low inter-layer coupling. These intrinsic Josephson junction (iJJ) systems4 have attracted considerable interest for their application poten ...

2014

Magnetism of Single Adatoms and Small Adsorbed Clusters Investigated by Means of Low-Temperature STM

Quentin Dubout

This thesis works reports on the magnetic properties of single transition metal atoms and hydrogenated compounds adsorbed on crystal surfaces. It is an experimental study, based on scanning tunneling microscopy (STM), initiated by the project of demonstrat ...

EPFL2013

Electron hopping at the Si(111):B-root 3 surface: Insight from local impurity spectroscopy

Cédric Tournier-Colletta

Boron vacancies at the Si( 111):B-root 3 surface are model systems in the comprehension of strongly correlated semiconductor surfaces. By using scanning tunneling spectroscopy, the origin of the single-vacancy electronic structure is addressed. It is shown ...

American Physical Society2013

Energy and symmetry of dd excitations in undoped layered cuprates measured by Cu L-3 resonant inelastic x-ray scattering

Marco Grioni, Thorsten Schmitt, Helmuth Berger, Marco Guarise

We measured the high-resolution Cu L-3 edge resonant inelastic x-ray scattering (RIXS) of undoped cuprates La2CuO4, Sr2CuO2Cl2, CaCuO2 and NdBa2Cu3O6. The dominant spectral features were assigned to dd excitations and we extensively studied their polarizat ...

Institute of Physics (IoP) and Deutsche Physikalische Gesellschaft2011

An important question in the physics of superconducting nanostructures is the role of thermal fluctuations (TFs) on superconductivity in the zero-dimensional limit. Here, we probe the evolution of superconductivity as a function of temperature and particle ...

2011

Electrically tunable molecules are highly attractive for the construction of molecular devices, such as switches, transistors, or machines. Here, we present a novel nanomechanical element triggered by an electrical bias as external stimulus. We demonstrate ...

2010

Real-Time Observation of Cuprates Structural Dynamics by Ultrafast Electron Crystallography

Fabrizio Carbone

The phonon-mediated attractive interaction between carriers leads to the Cooper pair formation in conventional superconductors. Despite decades of research, the glue holding Cooper pairs in high-temperature superconducting cuprates is still controversial, ...

2010