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)
[1] Grachtrup et al., Phys. Rev. B 85, 054410 (2012)
[2] Grachtrup et al., Phys. Rev. B 95, 134422 (2017)
*Work performed at NHMFL is supported by the National Science Foundation through DMR-1644779 and the State of FL. A portion of work is supported by the Center for Actinide Science and Technology, an EFRC funded by the US DOE under DE-SC0016568.
–
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