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Superconductivity and ferroelectricity coexist at LaAlO3/KTaO3 interfaces, a rare phenomenon. This interface exhibits enhanced superconducting transition temperatures and bistable transport properties, suggesting switchable ferroelectric polarization.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductivity and ferroelectricity have conflicting requirements, with superconductivity needing free charge carriers and ferroelectricity typically found in insulators.
  • The LaAlO3/KTaO3 interface is a unique system due to the quantum paraelectric properties of KTaO3.

Purpose of the Study:

  • To demonstrate the coexistence of two-dimensional superconductivity and ferroelectricity at the LaAlO3/KTaO3 interface.
  • To investigate the interplay between ferroelectric polarization and superconductivity in this system.

Main Methods:

  • Systematic gating and poling experiments were performed.
  • Raman scattering measurements and hysteresis loops were used to probe ferroelectricity.
  • Transport properties were analyzed to observe superconducting behavior.

Main Results:

  • Coexistence of two-dimensional superconductivity and ferroelectricity was demonstrated.
  • Superconducting transition temperature (Tc) was enhanced by ~0.2-0.6 K.
  • Bistable transport properties and hysteresis indicated switchable ferroelectric polarization below 50 K.

Conclusions:

  • Ferroelectric polarization reduces the dielectric constant, narrowing the potential well and confining carriers, thus enhancing Tc.
  • Switchable ferroelectric polarization modulates the potential well, leading to bistable transport properties.
  • This work establishes a mechanism coupling ferroelectricity and superconductivity, offering a platform for exploring their interplay.