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Coexistence of ferromagnetic fluctuations and superconductivity in the actinide superconductor UTe2

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arxiv 1905.06901 v2 pith:57DBJRYN submitted 2019-05-16 cond-mat.supr-con

Shyam Sundar , S. Gheidi , K. Akintola , A. M. Cote , S. R. Dunsiger , S. Ran , N. P. Butch , S. R. Saha
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J. Paglione J. E. Sonier
This is my paper · ORCID
classification cond-mat.supr-con
keywords fluctuationsdownmagneticactinideferromagneticmeasurementsmusrrelaxation
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We report low-temperature muon spin relaxation/rotation (muSR) measurements on single crystals of the actinide superconductor UTe2. Below 5 K we observe a continuous slowing down of magnetic fluctuations that persists through the superconducting (SC) transition temperature (Tc = 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 muSR measurements also indicate that the superconductivity coexists with the magnetic fluctuations.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Quasi-two-dimensional Fermi surfaces and unitary spin-triplet pairing in the heavy fermion superconductor UTe$_2$

    cond-mat.str-el 2019-08 conditional novelty 7.0 of 10

    UTe2 is predicted to host quasi-two-dimensional Fermi surfaces and a strong-spin-orbit-coupling unitary spin-triplet superconducting state with point nodes, ruling out non-unitary pairing.

  2. Microscopic evidence for a chiral superconducting order parameter in the heavy fermion superconductor UTe2

    cond-mat.mtrl-sci 2019-08 conditional novelty 7.0 of 10

    STM shows orientation-dependent in-gap edge states in UTe2, interpreted as signatures of chiral spin-triplet superconductivity.

  3. Novel universality class for the ferromagnetic transition in the low carrier concentration systems UTeS and USeS exhibiting large negative magnetoresistance

    cond-mat.str-el 2019-08 conditional novelty 6.0 of 10

    The ferromagnetic transitions in UTeS and USeS show critical exponents (beta around 0.30, gamma near 1.00, delta about 4.2 to 4.3) that differ from the 3D Ising model and resemble a common uranium-compound universality class.

  4. Spin-Orbit Coupling Induced Degeneracy in the Anisotropic Unconventional Superconductor UTe$_2$

    cond-mat.supr-con 2019-08 conditional novelty 6.0 of 10

    DFT+U calculations show that the Fermi level states of UTe2 are dominated by a half-filled, effectively degenerate j=5/2, mj=±1/2 pair, offering a basis for its half-gapped superconducting state.

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