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Bimodal Phase Diagram of the Superfluid Density in LaAlO3/SrTiO3 Revealed by an Interfacial Waveguide Resonator

Published inPhysical review letters, vol. 122, no. 3, 036801
Publication date2019-01-24
First online date2019-01-24
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.

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Affiliation Not a UNIGE publication
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Funding
  • European Commission - Designer Quantum Materials Out of Equilibrium [677458]
Citation (ISO format)
MANCA, Nicola et al. Bimodal Phase Diagram of the Superfluid Density in LaAlO<sub>3</sub>/SrTiO<sub>3</sub> Revealed by an Interfacial Waveguide Resonator. In: Physical review letters, 2019, vol. 122, n° 3, p. 036801. doi: 10.1103/PhysRevLett.122.036801
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ISSN of the journal0031-9007
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