Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 43: Correlated Electrons: Heavy Fermions 2
TT 43.3: Vortrag
Donnerstag, 26. März 2009, 16:15–16:30, HSZ 301
Field induced phases in the antiferromagnet UPt2Si2 — •Matthias Bleckmann1, Dirk Schulze Grachtrup1, Stefan Süllow1, Britta Willenberg1, Marek Bartkowiak2, Harison Rakoto3, and John A. Mydosh4 — 1Institut für Physik der Kondensierten Materie, Braunschweig, Germany — 2Hochfeld-Magnetlabor Dresden, Germany — 3National Pulsed Magnetic Field Laboratory , Toulouse, France — 4Institute of Physics II, Köln, Germany
Previously, UPt2Si2 has been described as a moderately mass enhanced antiferromagnet with a transition temperature of TN = 32 K [1]. In contrast, and more recently, it has been demonstrated that UPt2Si2 closely resembles the tetragonal heavy fermion superconductor/hidden order material URu2Si2 in various physical properties [2,3].
We present a detailed study of high field magnetization and resistivity on single crystalline UPt2Si2. While up to now the high field behavior of UPt2Si2 was discussed in terms of a crystalline electric field scheme applied to an f electron local moment system [4], we show that the high field behavior is much more complex than previously thought. In particular, the magnetic phase diagrams derived from our measurements contain various field induced phases, again analougous to URu2Si2. We compare the phase diagrams of both systems and discuss possible scenarios accounting for such behavior in UPt2Si2.
[1] R. A. Steeman, et al., J. Phys.: Condens. Matter 2, 4059 (1990).
[2] S. Süllow, et al., J. Phys. Soc. Japan 77, 024708 (2008).
[3] N. Johannsen, et al., Phys. Rev. B 78, 121103(R) (2008).
[4] G. J. Nieuwenhuys, Phys. Rev. B 35, 5260, (1987).