Dynamics of heavy carriers in the ferromagnetic superconductor UGe2

  • V. G. Storchak
  • J. H. Brewer
  • D. G. Eshchenko
  • P. W. Mengyan
  • O. E. Parfenov
  • A. M. Tokmachev


Superconductivity and ferromagnetism in a number of uranium-based materials come from the same f-electrons with a relatively large effective mass, suggesting the presence of a band of heavy quasiparticles, whose nature is still a mystery. Here, UGe2 dynamics in both ferromagnetic and paramagnetic phases is studied employing high-field μ+SR spectroscopy. The spectra exhibit a doublet structure characteristic to formation of subnanometer-sized magnetic polarons. This model is thoroughly explored here and correlated with the unconventional physics of UGe2. The heavy-fermion behaviour is ascribed to magnetic polarons; when coherent they form a narrow band, thus reconciling heavy carriers with superconductivity and itinerant ferromagnetism.


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Copyright information

© Pleiades Publishing, Inc. 2018

Authors and Affiliations

  • V. G. Storchak
    • 1
  • J. H. Brewer
    • 2
  • D. G. Eshchenko
    • 3
  • P. W. Mengyan
    • 4
    • 5
  • O. E. Parfenov
    • 1
  • A. M. Tokmachev
    • 1
  1. 1.National Research Center “Kurchatov Institute”MoscowRussia
  2. 2.Department of Physics and AstronomyUniversity of British ColumbiaVancouverCanada
  3. 3.Bruker BioSpin AGFällandenSwitzerland
  4. 4.Department of PhysicsNorthern Michigan UniversityMarquetteUSA
  5. 5.Department of PhysicsTexas Tech UniversityLubbockUSA

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