Browsing by Author "Kürten, Lukas"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • Thumbnail Image
    ItemOpen Access
    The superconductor-insulator-transition in the LaAlO3-SrTiO3 electron system : tunneling and field effect investigations
    (2017) Kürten, Lukas; Mannhart, Jochen (Prof. Dr.)
    The work described in this thesis investigated the superconductor-insulator- and BKT-transitions in a two-dimensional superconductor based on transition-metal oxides: the electron system at the LaAlO3-SrTiO3 interface. Thin films of insulating LaAlO3 grown onto insulating SrTiO3 substrates exhibit a two-dimensional electron system (2DES) with a superconducting ground state at the interface of the two materials. The ground state can be switched from superconducting to insulating behavior by application of a gate voltage. Therefore it is a useful tool for the investigation of these phase transitions. Additionally, LaAlO3-SrTiO3 exhibits a phase similar to the cuprate pseudogap phase in which electron transport is resistive, but a gap can be observed in the density of states in tunneling experimentswhich is not explicable by the standard BCS theory of superconductivity. The phase transitions were investigated by two complimentary pathways: by tunneling experiments on backgated samples and through the construction of superconducting transistors in which the electron system is influenced by the application of topgate voltages.