Field induced phases in UCr<sub>2</sub>Si<sub>2</sub>
ORAL
Abstract
In the broader family of (Ln-An)Cr2Si2 (Ln = lanthanide and An = actinide), UCr2Si2 is unique, where the system undergoes a structural (tetragonal to monoclinic) and antiferromagnetic phase transitions at TS = 210 K and TN = 27 K, respectively, and the U ions carry a magnetic moment. Here, we present an extensive study of the behavior in high magnetic fields. We have performed pulsed field torque magnetometry and resistivity measurements on single crystalline samples UCr2Si2 grown first time by molten flux method. Along the crystallographic c axis, at low temperatures, we find a metamagnetic-like transition in fields of the order 10 T, possibly indicating a first-order transition, the field induced phase transition moves to higher field and reaches maximum while the field is along the <101> diagonal of the tetragonal lattice. From our analysis of the data we can distinguish new high-field phases above the AFM ground state, which indicate the UCr2Si2 is possibly similar to what is seen for URu2Si2 and UPt2Si2, where the emergence of these new phase is due to the Fermi surface effects.
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Presenters
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You Lai
- Florida State University
- Los Alamos National Laboratory
- Florida State Univ