"Modulation of Superconducting Transition Temperature in LaAlO3/SrTiO3 by SrTiO Structural Domains"

Hilary Noad: Pascal Wittlich · Jochen Mannhart · Kathryn A. Moler; Journal of Superconductivity and Novel Magnetism, 06/19/19.

Additional Authors: Pascal Wittlich · Jochen Mannhart · Kathryn A. Moler

Abstract:

The tetragonal domain structure in SrTiO3 (STO) is known to modulate the normal-state carrier density in LaAlO3/SrTiO3 (LAO/STO) heterostructures, among other electronic properties, but the effect of STO domains on the superconductivity in LAO/STO has not been fully explored. Using a scanning SQUID susceptometer microscope to map the superconducting response as a function of temperature in LAO/STO, we find that the superconducting transition temperature is spatially inhomogeneous and modulated in a pattern that is characteristic of structural domains in the STO.