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)

*Funding Acknowledgement: Research at University of California San Diego, was supported by the National Nuclear Security Administration under the Stewardship Science Academic Alliance Program through the U.S. Department of Energy (DOE) under Grant No. DE-NA0004086, the U.S.DOE Basic Energy Sciences (BES) under Grant No. DE-FG02-04ER46105 and by UCSD MRSEC under the National Science Foundation Grant DMR-2011924. A portion of this work was performed at the National High Magnetic Field Laboratory (NHMFL), which is supported by National Science Foundation Cooperative Agreement DMR-2128556, and the Department of Energy (DOE). JS acknowledges support from the DOEBES program "Science of 100 T".

–

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