Bulk signatures of re-entrant superconductivity in UTe2 from ultrasound measurements

Abstract

We report bulk ultrasound measurements up to 77 T and down to 0.5 K of the field re-entrant superconducting phase of the unconventional superconductor UTe2. Clear bulk signatures of superconductivity are observed in the longitudinal c11 elastic mode for fields applied at a tilt angle of θ b-c = 30 • from b-axis. We confirm an upper critical field of Hc2 ≈ 65 T at 0.5 K and bulk superconductivity which survives up to T ≈ 2 K for fields above the metamagnetic transition. The c11 mode has propagation and displacement vectors along the a-axis, and for fields applied at a tilt angle of θ b-c = 30 • , this mode is sensitive to the elasticity of the vortex lattice. The anomalies observed in c11 are in part reminiscent of superconducting vortices pinned to lattice defects. Nonetheless, an excess attenuation, with respect to the normal state, is observed throughout the entire superconducting phase, suggesting unusual vortex dynamics and pinning in the field re-entrant superconducting phase of UTe2.

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BibTeX RIS

BibTeX

@misc{marquardt2026bulk,
  title = {{Bulk signatures of re-entrant superconductivity in UTe2 from ultrasound measurements}},
  author = {N Marquardt and C Duffy and C Proust and M Amano Patino and G Lapertot and D Aoki and J.-P Brison and G Knebel and D Leboeuf},
  howpublished = {HAL},
  year = {2026},
  month = aug,
  url = {https://hal.science/hal-05848118v1},
  note = {CC BY-NC-ND 4.0},
}

RIS

TY  - UNPB
TI  - Bulk signatures of re-entrant superconductivity in UTe2 from ultrasound measurements
AU  - N Marquardt
AU  - C Duffy
AU  - C Proust
AU  - M Amano Patino
AU  - G Lapertot
AU  - D Aoki
AU  - J.-P Brison
AU  - G Knebel
AU  - D Leboeuf
PY  - 2026
DA  - 2026/08/24
PB  - HAL
UR  - https://hal.science/hal-05848118v1
AB  - We report bulk ultrasound measurements up to 77 T and down to 0.5 K of the field re-entrant superconducting phase of the unconventional superconductor UTe2. Clear bulk signatures of superconductivity are observed in the longitudinal c11 elastic mode for fields applied at a tilt angle of θ b-c = 30 • from b-axis. We confirm an upper critical field of Hc2 ≈ 65 T at 0.5 K and bulk superconductivity which survives up to T ≈ 2 K for fields above the metamagnetic transition. The c11 mode has propagation and displacement vectors along the a-axis, and for fields applied at a tilt angle of θ b-c = 30 • , this mode is sensitive to the elasticity of the vortex lattice. The anomalies observed in c11 are in part reminiscent of superconducting vortices pinned to lattice defects. Nonetheless, an excess attenuation, with respect to the normal state, is observed throughout the entire superconducting phase, suggesting unusual vortex dynamics and pinning in the field re-entrant superconducting phase of UTe2.
ER  -

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