Article Title

Dynamics of Heavy Carriers in the Ferromagnetic Superconductor UGe2

Journal Title/Source

JETP Letters

Publication Date

2018

Volume

107

Page Numbers

470

DOI (if applicable)

https://doi.org/10.1134/S0021364018080040

Document Type

Journal Article

Department

Physics

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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