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Interfacially controlled transient photoinduced superconductivity.

V Peña1, T Gredig, J Santamaria

  • 1Department of Physics, University of California-San Diego, La Jolla, California 92093-0319, USA.

Physical Review Letters
|December 13, 2006
PubMed
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Visible light significantly boosts superconductivity in YBa2Cu3O(6.7)/La(0.7)Ca(0.3)MnO3 bilayers, increasing the critical temperature by 23 K. This rapid enhancement, lasting 100 seconds, suggests light-induced charge transfer at the interface.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • High-temperature superconductors (high-Tc) are crucial for advanced technologies.
  • Controlling superconducting properties with external stimuli like light is an active research area.
  • Previous studies observed persistent photoeffects in single superconducting films, but with much slower relaxation times.

Purpose of the Study:

  • To investigate the effect of visible light illumination on the superconducting critical temperature (Tc) of YBa2Cu3O(6.7)/La(0.7)Ca(0.3)MnO3 bilayers.
  • To characterize the dynamics and relaxation time of the photoinduced superconducting enhancement.
  • To explore the underlying mechanism responsible for the observed phenomenon.

Main Methods:

  • Fabrication of epitaxial YBa2Cu3O(6.7)/La(0.7)Ca(0.3)MnO3 bilayers.

Related Experiment Videos

  • Measurement of superconducting critical temperature (Tc) before and after visible light illumination.
  • Time-resolved measurements to determine the relaxation dynamics of the photoinduced effect at low temperatures.

    • Main Results:

    • A large, transient photoinduced enhancement of the superconducting critical temperature (Tc) was observed, with DeltaTc = 23 K.
    • The photoinduced effect exhibits a rapid relaxation with a characteristic time of 100 seconds at low temperatures.
    • This relaxation time is significantly faster (4 orders of magnitude) than previously reported persistent photoeffects in single superconducting films.

    Conclusions:

    • Visible light illumination can transiently enhance superconductivity in YBa2Cu3O(6.7)/La(0.7)Ca(0.3)MnO3 bilayers.
    • The rapid relaxation dynamics suggest a mechanism involving light-induced charge transfer across the YBa2Cu3O(6.7)/La(0.7)Ca(0.3)MnO3 interface.
    • This finding opens new avenues for ultrafast optical control of superconducting states.