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

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)
137 Downloads (Pure)

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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