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Angle Dependence of the Field-Induced Phases in UPt<sub>2</sub>Si<sub>2</sub>

ORAL

Abstract

The low temperature antiferromagnet (TN = 32 K) UPt2Si2 exhibits complex magnetic field-induced phases. Previous studies have established magnetic phase diagrams for applied fields along the a- and c-axes and suggest that the metamagnetic phase transitions (PT) may be associated with an evolution of the Fermi surface [1,2]. Here, we examine the PT angle dependence with RF skin depth and torque magnetometry experiments at temperatures T < 1 K and in fields H < 45 T. We find that AFMI → III evolves with nearly 1/cosθ dependence, III → V is hysteretic and nearly angle independent, and an additional PT in region V that also follows a 1/cosθ dependence. We shall discuss these results and the implications for the metamagnetism in UPt2Si2 and similar uranium-based materials.
[1] Grachtrup et al., Phys. Rev. B 85, 054410 (2012)
[2] Grachtrup et al., Phys. Rev. B 95, 134422 (2017)

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Presenters

  • Greta Chappell

    National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Florida State Univ, National High Magnetic Field Laboratory, Florida State University

Authors

  • Greta Chappell

    National High Magnetic Field Lab, Florida State University, National High Magnetic Field Laboratory, Florida State Univ, National High Magnetic Field Laboratory, Florida State University

  • 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

  • Kaya Wei

    Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL, USA.

  • You Lai

    Florida State University, Los Alamos National Laboratory, Florida State Univ

  • William Nelson

    National High Magnetic Field Laboratory/Florida State University, Florida State Univ, Physics, NHMFL, Florida State University

  • Benny Schundelmier

    Florida State Univ, Physics, University of West Florida, Univ of West Florida

  • Chris Mann

    Florida State Univ, University of Florida

  • Ryan Baumbach

    National High Magnetic Field Laboratory/Florida State University, MagLab Tallahassee, National High Magnetic Field Laboratory, National High Magnetic Field Lab, Florida State University, Florida State Univ, Natl High Magnetic Field Lab, National High Magnetic Field Laboratory, Florida State University, Physics, NHMFL, Florida State University