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Dynamics of Heavy Carriers in the Ferromagnetic Superconductor UGe2

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Abstract

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 behavior 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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Authors and Affiliations

  1. National Research Center Kurchatov Institute, Moscow, 123182, Russia

    V. G. Storchak, O. E. Parfenov & A. M. Tokmachev

  2. Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada

    J. H. Brewer

  3. Bruker BioSpin AG, Fällanden, 8117, Switzerland

    D. G. Eshchenko

  4. Department of Physics, Northern Michigan University, Marquette, Michigan, 79409-1051, USA

    P. W. Mengyan

  5. Department of Physics, Texas Tech University, Lubbock, Texas, 79409-1051, USA

    P. W. Mengyan

Authors
  1. V. G. Storchak
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  2. J. H. Brewer
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  3. D. G. Eshchenko
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  4. P. W. Mengyan
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  5. O. E. Parfenov
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  6. A. M. Tokmachev
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Correspondence to V. G. Storchak.

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Storchak, V.G., Brewer, J.H., Eshchenko, D.G. et al. Dynamics of Heavy Carriers in the Ferromagnetic Superconductor UGe2. Jetp Lett. 107, 470–476 (2018). https://doi.org/10.1134/S0021364018080040

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  • DOI: https://doi.org/10.1134/S0021364018080040

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