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Phase Diagram of Spin Triplet Superconductor UTe<sub>2</sub> Under Pressure and Magnetic Field

ORAL

Abstract

The heavy fermion superconductor UTe2 has recently drawn much attention due to several exotic properties. It exhibits two reentrant superconducting states under extremely high magnetic fields that appear correlated with ferromagnetic interactions [1-2], and has been proposed as a candidate three-dimensional topological superconductor [3-4]. Here, we report details of the field-temperature-pressure phase diagram of UTe2 under pressures up to 18.8kbar and high magnetic fields. Electrical resistivity and tunnel diode oscillator (TDO) measurements were performed under external magnetic field along the crystallographic b axis (hard axis), revealing a systematic progression of the superconducting and field-polarized phases that have relations to those observed at ambient pressure [2][5]. We will discuss our observations and their relevance on the interplay between ferromagnetism and superconductivity in this rich system.

[1] S. Ran et al., Science 365, 684 (2019)
[2] S. Ran et al., Nature Physics, accepted (2019)
[3] Lin Jiao et al., arXiv:1908.02846
[4] S. Bae et al. arXiv:1909.09032
[5] William Knafo et al., J. Phys. Soc. Jpn. 88, 063705 (2019)

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Presenters

  • Wen-Chen Lin

    University of Maryland, College Park

Authors

  • Wen-Chen Lin

    University of Maryland, College Park

  • Daniel J Campbell

    University of Maryland, College Park

  • David E Graf

    Florida State University, National High Magnetic Field Laboratory, Florida State University, Department of Physics, National High Magnetic Field Laboratory, Florida State University, Florida, USA, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory and Department of Physics, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Lab, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, USA, National High Magnetic Field Laboratory-Florida State University, National High Magnetic Field Laboratory, Tallahassee, FL, NHMFL, Florida State University, NHMFL

  • Sheng Ran

    NIST Center for Neutron Research, National Institute of Standards and Technology, University of Maryland, College Park, National Institute of Standards and Technology, Physics Department, University of Maryland, University of Maryland, University of Maryland, College Park & NIST, Department of Physics, University of Maryland, College Park, NIST Center for Neutron Research

  • Nicholas Butch

    NIST Center for Neutron Research, National Institute of Standards and Technology, National Institute of Standards and Technology, Center of Neutron Research, National Institute of Standards and Technology, Center for Neutron Research, National Institute of Standards and Technology, NIST Center for Neutron Research, NIST center for neutron research, NIST, NIST Center for Neutron Research, National Institute of Standards and Technology,, University of Maryland, College Park & NIST, National Institute of Standards and Technology Center for Neutron Research

  • Johnpierre Paglione

    University of Maryland, College Park, Physics Department, University of Maryland, Maryland Quantum Materials Center, Department of Physics, University of Maryland College Park, Department of Physics, University of Maryland, College Park, University of Maryland, College Park & NIST, Univ of Maryland-Colege Park, Center for Quantum Materials, University of Maryland, Maryland Quantum Materials Center, Department of Physics, University of Maryland-College Park,College Park, Maryland 20742