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Related Experiment Videos

Ferromagnetic superconductivity driven by changing Fermi surface topology.

K G Sandeman1, G G Lonzarich, A J Schofield

  • 1Low Temperature Physics Group, Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, United Kingdom.

Physical Review Letters
|May 7, 2003
PubMed
Summary
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A new Stoner model explains UGe2

Area of Science:

  • Condensed matter physics
  • Superconductivity
  • Magnetism

Background:

  • UGe2 is a unique ferromagnetic superconductor with an unusual phase diagram.
  • Understanding the interplay between ferromagnetism and superconductivity is a key challenge.

Purpose of the Study:

  • To develop a simple model explaining the phase diagram of UGe2.
  • To elucidate the mechanism driving triplet superconductivity in this material.

Main Methods:

  • A zero-temperature Stoner model was developed.
  • The model utilizes a quasi-one-dimensional band structure with a twin-peak density of states (DOS).

Main Results:

  • The model successfully explains the phase diagram of UGe2.

Related Experiment Videos

  • Triplet superconductivity is driven by tuning the Fermi level through peaks in the paramagnetic DOS.
  • These DOS peaks correlate with metamagnetic jumps.

    • Conclusions:

    • The proposed Stoner model provides a powerful explanation for UGe2's properties.
    • The interplay of ferromagnetism and triplet superconductivity is linked to specific electronic band structure features.