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Thermodynamic Evidence of Tetracritical Topology in the H−T Phase Diagram of UTe2 for H∥b

Michal Vališka*, Tetiana Haidamak, Andrej Cabala, Petr Proschek, and Vladimír Sechovský

Andreas Hauspurg and Sergei Zherlitsyn

  • Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

  • *Contact author: michal.valiska@matfyz.cuni.cz
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Phys. Rev. Lett. 137, 126003 – Published 15 September, 2026

DOI: https://doi.org/10.1103/1l46-jbm6

Abstract

We report ultrasound velocity measurements on an ultraclean UTe2 single crystal with Tc>2  K for H∥b, performed up to 18 T and down to 0.33 K. The measurements provide the missing bulk thermodynamic evidence for an additional high-field phase boundary near μ0H∼14–15  T. A distinct, nonhysteretic anomaly in the longitudinal C33 mode, together with a weaker response in C44, no resolvable anomaly in C55, and a coincident kink in transverse magnetostriction, reveals a symmetry-selective coupling to lattice strain. This mode selectivity places constraints on the symmetry of the field-induced superconducting component. The phase line remains nearly field constant near 14 T and meets three other phase boundaries at a tetracritical point near 13.5 T and 1.25 K. The results complete the local tetracritical topology of the H−T phase diagram and support field-induced multicomponent superconductivity in UTe2.

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Phys. Rev. Lett. 137, 126003– Published 15 September, 2026
  • Received 14 May 2026
  • Revised 20 July 2026
  • Accepted 24 August 2026
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