Sample manipulation in UHV

For more info about our services contact : help@bestpfe.com

Table of contents

1 Superconductivity of ultra-thin films 
1.1 Introduction
1.1.1 Thin superconductors: Early experiments and theories
1.1.2 Berezinskii-Kosterlitz-Thouless phase transition
1.1.3 Superconductor-insulator transition
1.1.4 Interface superconductivity
1.2 Superconductivity of atomically thin materials
1.2.1 Towards ultimately thin superconductors
1.2.2 Superconductivity in atomic layers: state of the art, open questions and challenges
1.3 Choice of the samples for studies
1.3.1 Ultra-thin NbN films
1.3.2 Atomic layers Pb(Au)/Si(111)
1.3.3 EuFe2(As0.79P0.21)2) single crystals
2 Elaboration and characterization of samples 
2.1 Introduction
2.2 Fabrication of atomic layers Pb/Si(111) and Pb/Au/Si(111)
2.2.1 In-air preparation of the Si-substrate
2.2.2 Sample manipulation in UHV
2.2.3 In-UHV Si(111) surface preparation
2.2.4 Au and Pb deposition
2.3 Structure of Pb/(Au)/Si(111) samples: LEED and STM
2.3.1 Surface Analysis: Low Energy Electron Diffraction
2.3.2 Surface Analysis: Scanning Tunneling Microscopy and Spectroscopy
2.3.3 Control of Si(111) 7×7 surface reconstruction
2.3.4 Striped incommensurate monolayers of Pb/Si(111)
2.3.5 5×2 reconstructed Au/Si(111) phase
2.3.6 Structure of Pb/Au/Si(111) hybrids
2.4 Characterization of NbN films
2.5 Characterization of EuFe2As2 single crystals
2.5.1 Structure
2.5.2 Phosphorus doped EuFe2As2
3 In-UHV electron transport of ultra-thin films 
3.1 Introduction
3.2 Probe design and fabrication
3.2.1 Analysis of available developments
3.2.2 Producing the base for the probe
3.2.3 Design and manufacturing of contacts
3.2.4 Probe integration and tests in air conditions
3.2.5 Preparing the probe for in situ UHV transport measurements
3.3 Transport properties of Pb/Si(111) and Pb/Au/Si(111)
3.3.1 Description of the experiments
3.3.2 Pb/Si(111) transport measurements
3.4 Pb/Au/Si(111) and SIC-Pb/Si(111) transport measurements
3.4.1 Measurement details
3.4.2 Pb/Au/Si(111) measurements
3.4.3 SIC-Pb/Si(111) transport measurements
3.5 Transport studies of disordered NbN films
3.5.1 Experimental details
3.5.2 Properties of as-grown NbN films
3.5.3 Sputtering effect on transport properties
4 Coexistence of ferromagnetism and superconductivity in EuFe(AsP) 
4.1 Introduction
4.1.1 Predictions of the coexistence of superconductivity and ferromagnetism
4.1.2 Bulk superconductors with magnetic ordering
4.1.3 Superconductor-ferromagnet artificial systems
4.1.4 Domain structure of the simple ferromagnet
4.2 Properties of the EuFe2(As1−xPx)2
4.2.1 Mechanisms responsible for superconductivity and ferromagnetism in the sample
4.2.2 Magnetic properties of the sample
4.3 Experimental methods
4.3.1 AFM/MFM technique
4.3.2 Crystal synthesis
4.4 Probing local and global properties of EuFe2(As0.79P0.21)2
4.4.1 Transport and magnetic properties
4.4.2 Superconductivity and magnetism: coexistence
4.4.3 Variations of local magnetic properties with temperature
4.4.4 MFM experiments in a magnetic field. Hysteresis curve
5 Conclusions and Perspectives 
Bibliography