Master's thesis

Microwave Probing of Superconductivity in SrTiO3

Microwave Spectroscopy, Dilute Metal, Multi-Band Physics

 

SrTiO3 is a wide-bandgap semiconductor with various unique physical properties. For example, it becomes superconducting upon electronic doping already at rather low charge densities. This superconducting state can be tuned with doping, leading to successively more electronic bands that contribute to the superfluid condensate. Corresponding to the critical temperature around 0.3K, the superconducting energy gap is around 20GHz and can thus be probed with microwave spectroscopy. In this project we want to address two aspects of superconducting SrTiO3: Firstly, we want to understand the role of multi-band superconductivity by studying the microwave properties as a function of magnetic field. Secondly, we want to perform microwave spectroscopy on the superconducting interface between insulating SrTiO3 and LaAlO3. This superconducting interface can be controlled by applying a gate voltage, and thus offers fascinating prospects as a tuneable superconductor. These experiments would be the first to quantify the superconducting gap of the SrTiO3/LaAlO3 interface by microwave spectroscopy.

 (c) Superfluid density as function of magnetic field and temperature indicates the different superconducting electronic bands. (M. Zinsser, MSc Thesis 2018)
Marc Scheffler
Dr.

Marc Scheffler

Head of the Microwave Lab

Martin Dressel
Prof. Dr. rer. nat.

Martin Dressel

Head of Institute

To the top of the page