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Long-range superharmonic Josephson current.

Luka Trifunovic1

  • 1Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland.

Physical Review Letters
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

An odd number of Cooper pairs cannot propagate far in a superconductor-ferromagnet-superconductor junction with a single spin-active region. At low temperatures, two Cooper pairs dominate, leading to a superharmonic current-phase relation (I ∝ sin2ϕ).

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Area of Science:

  • Condensed matter physics
  • Superconductivity
  • Spintronics

Background:

  • Superconductor-ferromagnet-superconductor (SFS) junctions are crucial for understanding exotic quantum phenomena.
  • Spin-active regions in SFS junctions significantly influence the behavior of Cooper pairs.

Purpose of the Study:

  • To investigate the propagation of Cooper pairs in a long SFS junction with a single spin-active region.
  • To determine the conditions under which Cooper pair transport can occur and analyze the resulting current-phase relations.

Main Methods:

  • Theoretical analysis of electron transport in a long SFS junction.
  • Consideration of the influence of a single spin-active region on Cooper pair coherence.
  • Analysis of the system's behavior at temperatures significantly lower than the Thouless energy.

Main Results:

  • Demonstration that an odd number of Cooper pairs cannot achieve long-range propagation in the presence of a single spin-active region.
  • Identification of the coherent transport of two Cooper pairs as the dominant mechanism at low temperatures (T << Thouless energy).
  • Derivation of a superharmonic current-phase relation (I ∝ sin2ϕ) for the system.

Conclusions:

  • The presence of a single spin-active region fundamentally alters Cooper pair propagation in SFS junctions.
  • Coherent transport of two Cooper pairs dictates the electrical characteristics at low temperatures.
  • The observed superharmonic current-phase relation offers insights into novel superconducting electronics and spintronic devices.