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High Magnetic Field Phase Diagram of Thorium Substituted UTe<sub>2</sub>

ORAL

Abstract

UTe2 has been a hot topic since the discovery of two magnetic field induced re-entrant superconducting phases. [1,2] However, the relationship between these phases to the zero-magnetic field superconducting phase is not well understood. Recent work has shown that tellurium deficiency, already known to suppress superconductivity at zero magnetic field [3], does not suppress the field polarized and ‘Lazarus’ superconducting high magnetic field phases [4] and that evidence exists that the ‘Lazarus’ superconducting phase occurs due to the Jaccarino-Peter effect. [5] Here we substitute thorium for uranium and investigate the phase diagram as a function of magnetic field (up to 60 T) at low temperatures by PDO measurements. While we still detect a zero-magnetic field superconducting phase for thorium substituted samples with up to 5% nominal thorium content, we observe a disappearance of all the high magnetic field phases in samples with nominal thorium contents above 2%. We also see an evolution in the zero-field superconducting phase as a function of angle with increasing thorium content.

[1] S. Ran, et al. Nat. Phys. 15, 1250–1254 (2019).

[2] G. Knebel, et al. J. Phys. Soc. Jpn. 88, 063707 (2019)

[3] C. Yang, et al. Phys. Rev. B 106, 024503 (2022)

[4] C. E. Frank, et al. Nat. Comm. 15, 3378 (2024)

[5] T. Helm, et al. Nat. Comm. 15, 37 (2024)

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Presenters

  • Camilla M Moir

    University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

Authors

  • Camilla M Moir

    University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

  • John Singleton

    Los Alamos National Laboratory (LANL)

  • Joanna Blawat

    Los Alamos National Laboratory (LANL)

  • Eric Lee-Wong

    University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

  • Yuhang Deng

    University of California, San Diego, Department of Physics, University of California, San Diego, CA 92093, USA

  • Keke Feng

    Department of Physics, University of California, San Diego, University of California, San Diego, University of California San Diego

  • Ryan E Baumbach

    Department of Physics, University of California, Santa Cruz, CA 95064, USA, UC Santa Cruz

  • M. Brian Maple

    University of California, San Diego, University of California San Diego, Department of Physics, University of California, San Diego, CA 92093, USA