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TT: Tiefe Temperaturen
TT 16: Postersitzung II: Amorphe und Tunnelsysteme, Mesoskopische Systeme, Schwere Fermionen, Kernmagnetismus
TT 16.39: Poster
Tuesday, March 27, 2001, 14:30–17:00, Rang S\ 3
Magnetic Phase Diagram of PrPb3 — •Ralf Vollmer1, Gernot Goll1, Christian Pfleiderer1, M. Brian Maple1,2, Hilbert v. Löhneysen1,3, and Paul C. Canfield4 — 1Physikalisches Institut, Universität Karlsruhe, D-76128 Karlsruhe, Germany — 2Institute for Pure and Applied Physical Sciences, University of California San Diego, La Jolla, CA 92093, USA — 3Institut für Festkörperphysik, Forschungszentrum Karlsruhe, D-76021 Karlsruhe — 4Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50010, USA
PrPb3 exhibits antiferroquadrupolar order as seen by magnetization measurements [1] and neutron scattering [2]. The previously observed increase of the antiferroquadrupolar ordering temperature TAFQ=0.39 K in zero magnetic field up to TAFQ=0.66 K in 6 T is confirmed by specific heat measurements. In addition to this second-order transition, we find a first order transition - as evidenced by strong hysteresis effects - at T1=0.35 K for 3 T and 0.49 K for 4.5 T. Surprisingly, both phase transitions are independent of hydrostatic pressure p up to p=6.5 kbar. Measurements of the magnetocaloric effect are under way to complete the anomalous phase diagram of this cubic compound.
[1] T. Sakakibara et al., Physica B 259-261 (1999) 340-342.
[2] W. Gross et al., Z. Phys. B 37 (1980) 123.