Dynamics of Heavy Carriers in the Ferromagnetic Superconductor UGe2 |
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| Authors: | V. G. Storchak J. H. Brewer D. G. Eshchenko P. W. Mengyan O. E. Parfenov A. M. Tokmachev |
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| Affiliation: | 1.National Research Center Kurchatov Institute,Moscow,Russia;2.Department of Physics and Astronomy,University of British Columbia,Vancouver,Canada;3.Bruker BioSpin AG,F?llanden,Switzerland;4.Department of Physics,Northern Michigan University,Marquette,USA;5.Department of Physics,Texas Tech University,Lubbock,USA |
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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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