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The Effects of Annealing in UTe<sub>2</sub>

ORAL

Abstract

The spin-triplet candidate superconductor UTe­2 [1] crystallizes in the Immm space group, a = ~4.16 Å, b = ~6.14 Å, and c = ~13.98 Å, and contains three crystallographic sites, one U site which occupies the 4i position and two Te sites, where Te1 occupies the 4j position and Te2 occupies the 4h position [2]. An intrinsic multicomponent superconducting order parameter has been suggested to exist in UTe2 [3] although contrasting reports indicate that the double superconducting transitions arise due to inhomogeneity within the crystal [4-6]. Recent work has optimized Tc by lowering growth temperatures, reaching the highest reported Tc of 2.0 K. In this talk, I will discuss the evolution of superconducting transition(s) in UTe2 as a function of annealing via thermodynamic measurements. In addition, detailed single crystal X-ray diffraction studies will highlight crystallographic differences in samples with double or single superconducting transitions to elucidate their origin.

[1] S. Ran et al. Science 365, 684 (2019)

[2] A. J. K. Haneveld et al. J. Less-Common Met. 21, 45 (1970)

[3] I. M. Hayes et al. Science 373, 797 (2021)

[4] L. P. Cairns et al. J. Phys.: Condens. Matter 32, 415602 (2020)

[5] S. M. Thomas et al. arXiv:2103.09194 (2021)

[6] P.F.S. Rosa et al. arXiv:2110.06200 (2021)

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Publication: P.F.S. Rosa et al. arXiv:2110.06200 (2021)

Presenters

  • Ashley Weiland

    Los Alamos National Laboratory

Authors

  • Ashley Weiland

    Los Alamos National Laboratory

  • Shannon S Fender

    Berkeley, Los Alamos Natl Lab

  • Filip Ronning

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Joe D Thompson

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.

  • Eric D Bauer

    Los Alamos Natl Lab, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Sean M Thomas

    Los Alamos National Laboratory, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A., Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA

  • Priscila Rosa

    Quantum Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA, Los Alamos National Laboratory