We report low-temperature muon spin relaxation/rotation (SR) measurements on single crystals of the actinide superconductor UTe. Below 5 K we observe a continuous slowing down of magnetic fluctuations that persists through the superconducting transition temperature ( = 1.6 K), but we find no evidence of long-range or local magnetic order down to 0.025 K. The temperature dependence of the dynamic relaxation rate down to 0.4 K agrees with the self-consistent renormalization theory of spin fluctuations for a three-dimensional weak itinerant ferromagnetic metal. Our SR measurements also indicate that the superconductivity coexists with the magnetic fluctuations.
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| http://dx.doi.org/10.1103/physrevb.100.140502 | DOI Listing |
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