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

ORAL

Abstract

UTe2 has been thrust into the spotlight since the discovery of two magnetic field induced re-entrant superconducting phases a few years ago. [1,2] However, the relationship between these phases to the zero-magnetic field superconducting phase is not that well known. Recent work has discovered 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] 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 proximity diode oscillator 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 above 2% nominal thorium content.

[1] Ran, S., Liu, IL., Eo, Y.S. et al. Extreme magnetic field-boosted superconductivity. Nat. Phys. 15, 1250–1254 (2019).

[2] G. Knebel, W. Knafo, A. Pourret, et al Field-Reentrant Superconductivity Close to a Metamagnetic Transition in the Heavy-Fermion Superconductor UTe2 J. Phys. Soc. Jpn. 88, 063707 (2019)

[3] C. Yang, J. Guo, S. Cai, et al. Quasi-uniaxial pressure induced superconductivity in the stoichiometric compound UTe2 Phys. Rev. B 106, 024503 (2022)

[4] C. E. Frank, S. K. Lewin, G. S. Salas, et al.Orphan High Field Superconductivity in Non-Superconducting Uranium Ditelluride

arXiv:2304.12392 [cond-mat.supr-con] (2023)

*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 DOE BES program "Science of 100 T".

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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

    • National High Magnetic Field Laboratory

  • Eric J Lee-Wong

    • UC San Diego Maple Laboratory

  • Yuhang Deng

    • University of California, San Diego

  • Ryan E Baumbach

    • National High Magnetic Field Laboratory
    • National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32306, USA

  • M. Brian Maple

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