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Kondo effect in electromigrated gold break junctions.

A A Houck1, J Labaziewicz, E K Chan

  • 1Center for Bits and Atoms and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Nano Letters
|September 15, 2005
PubMed
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We observed Kondo impurities in gold using controlled electromigration, finding Kondo temperatures around 7 K. These Kondo resonances may stem from atomic-scale metallic grains formed during the process.

Area of Science:

  • Condensed matter physics
  • Quantum phenomena
  • Nanotechnology

Background:

  • Kondo effect is a quantum mechanical phenomenon observed in dilute magnetic alloys.
  • Understanding Kondo impurities in nanoscale systems is crucial for quantum electronics.

Purpose of the Study:

  • Investigate Kondo impurities in bare gold break junctions.
  • Characterize their properties using gate-dependent transport measurements.

Main Methods:

  • Fabrication of gold break junctions using controlled electromigration.
  • Gate-dependent electrical transport measurements.
  • Variable temperature and magnetic field measurements.

Main Results:

  • High yield fabrication of devices showing Kondo impurities.

Related Experiment Videos

  • Observed zero-bias conductance peaks in 30% of devices.
  • Kondo temperatures estimated at approximately 7 K.
  • Magnetic field splitting consistent with theory but with a fixed energy offset.

    • Conclusions:

    • Kondo resonances observed in gold break junctions.
    • Results suggest the presence of atomic-scale metallic grains.
    • Provides insights into quantum transport in nanoscale metallic systems.