Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTi O3 Revealed by an Interfacial Waveguide Resonator
Nicola Manca (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
Daniel Bothner (Kavli institute of nanoscience Delft, TU Delft - QN/Steele Lab)
Ana M.R.V.L. Monteiro
Dejan Davidovikj (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)
Yildiz G. Saǧlam (TU Delft - QN/Caviglia Lab, Kavli institute of nanoscience Delft)
Mark Jenkins (Kavli institute of nanoscience Delft, TU Delft - QN/Steele Lab)
Marc Gabay (Université Paris-Saclay)
Gary A. Steele (Kavli institute of nanoscience Delft, TU Delft - QN/Steele Lab)
Andrea D. Caviglia (Kavli institute of nanoscience Delft, TU Delft - QN/Caviglia Lab)
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Abstract
We explore the superconducting phase diagram of the two-dimensional electron system at the LaAlO3/SrTiO3 interface by monitoring the frequencies of the cavity modes of a coplanar waveguide resonator fabricated in the interface itself. We determine the phase diagram of the superconducting transition as a function of the temperature and electrostatic gating, finding that both the superfluid density and the transition temperature follow a dome shape but that the two are not monotonically related. The ground state of this two-dimensional electron system is interpreted as a Josephson junction array, where a transition from long- to short-range order occurs as a function of the electronic doping. The synergy between correlated oxides and superconducting circuits is revealed to be a promising route to investigate these exotic compounds, complementary to standard magnetotransport measurements.