Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTi O3 Revealed by an Interfacial Waveguide Resonator

Nicola Manca, Daniel Bothner, Ana M.R.V.L. Monteiro, Dejan Davidovikj, Yildiz G. Saǧlam, Mark Jenkins, Marc Gabay, Gary A. Steele, Andrea D. Caviglia

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1 Citation (Scopus)
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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.

Original languageEnglish
Article number036801
Number of pages6
JournalPhysical Review Letters
Volume122
Issue number3
DOIs
Publication statusPublished - 2019

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