Field induced phases in UPt2Si2

Abstract

The tetragonal compound UPt2Si2 has been characterised as a moderately mass enhanced system with an antiferromagnetic ground state below T_N = 32 K. Here, we present an extensive study of the behavior in high magnetic fields. We have performed pulsed field magnetization and static field resistivity measurements on single crystalline samples UPt2Si2. Along the crystallographic a axis, at low temperatures, we find a metamagnetic-like transition in fields of the order 40 T, possibly indicating a first order transition. Along the crystallographic c axis, in magnetic fields of B>= ~24 T, we find distinct anomalies in both properties. From our analysis of the data we can distinguish new high field phases above the AFM ground state. We discuss the emergence of these new phases in the context of Fermi surface effects and the possible occurrence of a Lifshitz or electronic topological transition, this in contrast to previous modellings of UPt2Si2 based on crystal electric field effects.

10 pages, submitted to PRB

References in corpus (8)

• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Magnetic-Field Dependence of the YbRh2Si2 Fermi Surface
• Quantum and Topological Criticalities of Lifshitz Transition in Two-Dimensional Correlated Electron Systems
• The Fermi surface and f-valence electron count of UPt3
• Magnetic-field induced band-structure change in CeBiPt
• Monte Carlo investigation of the tricritical point stability in a three-dimensional Ising metamagnet
• X-ray photoemission spectrum, electronic structure, and magnetism of UCu${}_2$Si${}_2$
• Magneto-thermal evidence of a partial gap at the Fermi surface of UPt_2Si_2

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• Magnetotransport as a probe of phase transformations in metallic antiferromagnets: the UIrSi${}_3$ case
• Field induced Lifshitz transition in UPt${}_2$Si${}_2$: Fermi surface under extreme conditions
• Peculiar Magnetism of UAu${}_2$Si${}_2$
• Magnetic and electronic phases of U${}_2$Rh${}_3$Si${}_5$
• Multiple localized-itinerant dualities in magnetism of 5f electron systems. The case of UPt${}_2$Si${}_2$