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Ferromagnetic 0-pi junctions as classical spins.

M L Della Rocca1, M Aprili, T Kontos

  • 1Ecole Supèrieure de Physique et Chimie Industrielles (ESPCI), Paris, France. marilu@sa.infn.it

Physical Review Letters
|August 11, 2005
PubMed
Summary
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Highly damped PdNi based 0-pi ferromagnetic Josephson junctions exhibit spontaneous half quantum vortices. These junctions act like classical spins, showing random but reproducible shifts in their magnetic diffraction patterns.

Area of Science:

  • Condensed Matter Physics
  • Quantum Magnetism
  • Superconductivity

Background:

  • Ferromagnetic Josephson junctions with 0-pi states are crucial for quantum computing.
  • Understanding their ground states is key to controlling quantum phenomena.

Purpose of the Study:

  • To investigate the ground state properties of highly damped PdNi based 0-pi ferromagnetic Josephson junctions.
  • To characterize the spontaneous half quantum vortex and its associated supercurrent.

Main Methods:

  • Fabrication and characterization of PdNi based 0-pi ferromagnetic Josephson junctions.
  • Measurement of magnetic diffraction patterns to analyze the supercurrent's effect.
  • Statistical analysis of the observed flux shifts.

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Main Results:

  • A spontaneous half quantum vortex was observed in the ground state.
  • A supercurrent of undetermined sign was identified, causing a phi(0)/4 shift.
  • The shift sign was random, but its magnitude was reproducible, mimicking classical spin behavior.

Conclusions:

  • 0-pi Josephson junctions exhibit characteristics of classical spins, similar to magnetic nanoparticles.
  • The observed phenomena offer insights into controlling quantum states in superconducting devices.