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TT: Fachverband Tiefe Temperaturen

TT 44: Poster Session Correlated Electrons

TT 44.17: Poster

Donnerstag, 17. März 2011, 10:00–13:00, P1

Exotic field induced phases in UPt₂Si₂ — •D. Schulze Grachtrup¹, M. Bleckmann¹, B. Willenberg¹, H. Rakoto², I. Sheikin³, Y. Skourski⁴, M. Bartkowiak⁴, J.A. Mydosh⁵, and S. Süllow¹ — ¹IPKM, TU Braunschweig, Germany — ²LNCMI, Toulouse, France — ³LNCMI, Grenoble, France — ⁴HLD, Dresden, Germany — ⁵LION, Leiden University, Netherlands

Tetragonal UPt₂Si₂ has been characterized as a moderately mass enhanced antiferromagnetic compound (T_N = 32 K), which in low magnetic fields resembles other materials such as URu₂Si₂ [1-3]. Here,we present an extensive study of resistivity and magnetization of single crystalline UPt₂Si₂ in high magnetic fields up to 50 T. Initially we find the phase transition at T_N = 32 K in zero field to shift down to lower temperatures with increasing field for both crystallographic axes. Below ∼ 15 K and for B//a we see this transition to split up and become hysteretic, forming a new and distinct high field phase between ∼38T and ∼45T. Similarly, with B//c we also find a splitting resulting in a new high field phase between ∼24 T and ∼31 T. Moreover, below 5K our measurements along the c axis show even more structure, indicating at least one more high field phase between ∼29 T and ∼33 T. Altogether, our data reveal a rich magnetic high field phase diagram, which resembles some observations made for URu₂Si₂ [4].
[1] S. Süllow et al., J. Phys. Soc. Jpn. 77 (2008) 024708
[2] N. Johannsen et al., Phys. Rev. B 78 (2008) 121103(R)
[3] R. A. Steeman et al., J. Phys.: Condens. Matter 2 (1990) 4059
[4] K. H. Kim et al., Phys. Rev. Lett. 91 (2003) 256401