Density-tuned isotherms and dynamic change at the superconducting transition in a gate-controlled ${\mathrm{AlO}}_{x}/{\mathrm{SrTiO}}_{3}$ heterostructure - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2022

Density-tuned isotherms and dynamic change at the superconducting transition in a gate-controlled ${\mathrm{AlO}}_{x}/{\mathrm{SrTiO}}_{3}$ heterostructure

Résumé

Two-dimensional electron gases in SrTiO3-based heterostructures provide a platform to study the real-time evolution of the macroscopic state with a variation of the carrier density, and the impact of structural properties on the emergence of the superconducting state. We have explored the isothermal evolution of the electron gas in AlOx/SrTiO3 by measuring the variation of resistance with continuous gate-voltage-controlled tuning of its carrier density. It is seen that condensation of the ordered phase leads to non-monotonic isotherms within the superconducting dome. The timescale for dynamic change following changes in gate voltage is measured across the phase transition. It is found to be tens of seconds near the onset of superconductivity, significantly larger compared to the normal state. Such a large timescale governing the kinetics of the phase transition presumably arises from the strong impact of structural defects and distortions of the substrate on the development of superconducting islands.
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Dates et versions

hal-03157551 , version 1 (03-03-2021)
hal-03157551 , version 2 (08-04-2021)
hal-03157551 , version 3 (06-09-2022)

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Shamashis Sengupta, Miguel Monteverde, Anil Murani, Claire Marrache-Kikuchi, Andrés F Santander-Syro, et al.. Density-tuned isotherms and dynamic change at the superconducting transition in a gate-controlled ${\mathrm{AlO}}_{x}/{\mathrm{SrTiO}}_{3}$ heterostructure. Physical Review B, 2022, 105 (12), pp.125112. ⟨10.1103/PhysRevB.105.125112⟩. ⟨hal-03157551v3⟩
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